How much calorie reduction is too much?

Can you open your diary? Also, how tall are you?

Get your thyroid checked first.
If all is well with your thyroid then you are eating more than you think.
Buy a food scale and weigh everything you eat.
Measure caloric liquids with measuring cup and spoons.
Log everything you ingest everyday.
Eat back only 1/2 your exercise calories.
You will see a loss.

Edited for spelling.

So I have been struggling with my weight for years now. I currently weigh 230 lbs.
And I have no idea why.
I have an EXTREMELY active Job, and I have two separate fitness trackers that I wear/Carry to keep track of how much I walk and move during the day.
This week alone. (5 days) I was moving and had my heart rate up for a total of 14 hours. I walked nearly 60 miles. I normally walk at about a 4.0-4.6 pace depending on he day.

I have been maintaining my calorie intake at about 1200 calories, and I try to get up to 1600 calories on the days I am active for over 5 hours.

Everywhere I have read, it says that if you eat less than your outtake, you will loose weight.
So I really don't comprehend the problem.

And I have been working at this job for 9 months. So it's not new. And I have actually gone up from a size 14 to a size 18 since I began this job.

It would be different if the weight was all muscle. But I have a belly that is clearly fat, and I am thick in other places as well.

So am I not eating enough?
Could it be something else?
Thyroid problems run in my family, but I wouldn't think that with the amount of calories I burn that it would make any difference.

Does anyone have any experience or advice they can give?

Aim for a -250 to -500 caloric reduction below your BMR + any extra physical activity you add on on top of that.

Lets say your BMR is 1800 calories a day, but your physical job, burns an extra 400 throughout the day on top of that. Your BMR (basal metabolic rate)is now 2200 calories, meaning this is your break even point. No gain, no loss.

Aim to eat at a -250 to -500 deficit. This is generally the safest and easiest way to maintain long term, consistent weight loss.

Now there are always exception to these rules and many people will react differently, but this is a good general rule of thumb to follow.

Also, even in the most extreme cases of a thyroid problems, it is estimated it can affect you up to a -10% slower rate on your RMR (resting metabolic rate) versus someone who does not have issues with their thyroid.

Personally, I'd buy a heart rate monitor that calculates calories burned based off of your heart rate and use that to best guesstimate how much extra calories you are burning while at work. You may be burning far more than you realize.

Also, what are the calories you do eat, consist of? Can you open up your food diary? Are you weighing your food? It's possible you could be eating way more than you realize as well.