Enlighten me please. How come people are closing

On days I'm not as hungry I eat less, in case there are days where I am hungrier and eat more. By the end of the week it evens out.

Ever since I heard that all those food labels we rely on were allowed to be off by up to 20% I decided it's better safe than sorry. Plus I don't weigh my food I just use measuring cups so I probably under estimate. Add those two thing together and when I eat exactly my goal and eat back my exercise calories...my results suffer. So I leave my self a little buffer. I probably am getting closer to my goal than it seems.

I am attempting to come within 75 calories of my NET without going over. I do this so that when something isn't measured or estimated correctly I don't stress it. Today I am 150 under but I'm done for the day as I'm really not hungry and it's quarter till 11

^^This

I want to get close, but I try my best not to go over. I try to enter my food as I eat it and keep my lunch and dinner to 300-400 calories. This way I know I'm not going over. If I see 800 calories to go at supper time, that means I can eat normally and be 200-300 calories under, or can allow myself a cookie. Either way.

I also use water. Hungry? Drink some water first. Wait 30 mins. Drink more water. Wait another 30 minutes. Still hungry? Eat. Spacing out my food like that also means I've eaten less by the end of the day.

I aim to be near but never above my goal, so that i lose at the rate I have set, or slightly faster.

But I also log my exercise, and the calculator generally overestimates calories burned. So I take that into account when I am considering eating more because I have burned some. I do aim to net my goal, but I consider that the extra calories allotted from workouts are too many extra calories, so I don't eat all of them.
I do a good bit of rock climbing, and especially long-distance hiking. I know for certain that I don't burn an extra 3000 calories on an easy day hike. So whenever I do pretty much anything out in the mountains, my diary would show that I netted few or even negative calories. Rather than try to calculate to MFP's wonky numbers, I just assume I can use a few more calories on mountain days, but nowhere near what it estimates.
Obviously you haven't been looking at my diary, but others may have similar reasons.

And, of course, I'm really working on learning to listen to my body and eat when I'm hungry and not eat when I am not. So if I don't feel hungry on a day, I try to not keep eating even if I could have more calories.

If you feel satiated, why would you force yourself to eat more? if you're close, you'll be aiiiight.

I can only speak for myself, but If I'm not hungry, I'm not going to force myself to eat (which is why I'm here in the first place). I''m not using MFP #s but ones suggested to me by my MD & the RD I met with (which was anyplace from 1200-1500 calories) If I was using MFP stats, I'd never "eat enough" and would always be eating under their "goal"

I also am not 100% sure of the calorie etc counts of a lot of the food I'm eating (i.e if I eat outside the house), so I want to leave myself some extra calories just to cover what I might be incorrectly logging. I also am not eating back my exercise calories.

Everyone's situation is different. I have a sedentary job & am on medications for various health issues. I for one am not starving myself and more often than not, am closing my food diary eating under my goal which is 1400 calories. I could have easily picked 1200 and then I'd be on target when I closed the diary for the day.

My usual reason is that I ate as much as I felt that I needed to, and didn't want to eat just for the sake of eating.

I didn't just change the foods that I eat when I decided to lose weight. I chose to change the way I eat it, too. I used to snack during the day or pick my dinner long after I was full just for the sake of flavor. But I try to avoid that now. I only eat when I'm hungry, and when I'm not hungry anymore, I stop.

And if I have a day where I eat more fruits and veggies than anything else, I fill up on fewer calories.

Because it's REALLY difficult to get your "remaining calories" right on 0. (Well not really hard, but you have to get very pedantic with small bits of celery and single almonds And pretty meaningless anyway, as all the food and exercise we log is a estimate anyway).

My diary is almost always going to be under or over, sometimes by a lot, sometimes by a little.

And also I think because lots of people have the "must starve self to lose weight" mentality so they will deliberately try to eat less than MFP recommends, which just isn't necessary.

Sometimes when I exercise a ton, I just can't eat back all those calories. It's not because i don't want to, and it's not because I'm starving myself.

I watch my diary like a hawk and log everything, drinks and supplements included. Now, I did have a rough patch recently where I didn't log hardly anything and the scale said I maintained so...? It was a few days and I was really not "feeling it". I posted as much for MFP to know that, Yes I am here but not making too much of an effort today.

If I'm that many calories under for the day I'll sit down with a good book and eat as many raw unsalted almonds as I want to. Usually I'm done by 1/2 cup and have made up for what calories I had been lacking. Other posters have said that it's just an estimate and it's true. We estimate the best we can and for us super busy moms (gotta plug the stay at home mommas of the world!) we just forget. Plain and simple. The cooking, cleaning, running errands, doing arts and crafts and the million other things we do in the day cause us to have selective memories about every single morsel of food we put into our mouths. I'm sometimes guilty of that too.