So the Fitbit food plan has no bearing on the math done on MFP for it's food plan - which one are you really using?

So from that TDEE range of 2150 - 2350, the 250 cal deficit is 11 - 12%, so not unreasonable at all.
That does mean 2 weeks to see a 1 lb loss of fat.

Of course, are you correcting the Fitbit burn with manually entered workouts that are NOT step based?

Because lifting, spin, row, swimming, elliptical, ect - all will be vastly underestimated, and if your TDEE is actually higher, then your deficit is much bigger than 11-12%, and may be unreasonable.

Then again, with only 250 deficit, accuracy is of importance on eating side.

Weighing all foods that enter the mouth. Could easily wipe on a couple days deficit with one badly estimated eating out meal.

And for a woman, your BMR literally changes through the month, so yes too short a time too, but confirm above while you wait.

Also only using valid weigh-in days, because just a minor expected water weight fluctuation will wipe out any real loss.
Morning after rest day eating normal sodium levels, not sore from last workout.

It's not bad even though it's not valid, unless the fact that you are holding extra water weight is going to discourage and stress you.

Careful of the food logging though.
If you do any packaged items, at least get calculator and confirm what they are, total weight in package divided by how much you eat per serving in grams. "About 2" can be 1.75 from soups and cottage cheese to 2.45 on some calorie dense things I've had.

Most your foods could go one direction or the other, either creating more deficit or wiping it out.

I'm a month into cut, and I'm in the same boat. But Im in this for the long run. I've packed my scale away, and my body fat calculator. Just going to ride out July and not weight in until August. I still do have confusion too about the fitbit, Scooby's, MFP, addng back exercise too. Can't see to get a completely clear answer. I'm a very active mom, so My fit bit is estimating an average burn of 2800 calories. That is ALOT, and I only burn about 350/workout. But running after a two year old on the baseball parks burns a lot of calories.

What I am doing this week is cleaning up my act. I'm only eating what I KNOW the measurements of. No more guestimating. I'm pretty much sticking to protein, brown rice, sweet potatoes, and a green veggie. I will keep you posted on my progress. P.S. I sent you a friend request! Let's hang in there.

I'm a month into cut, and I'm in the same boat. But Im in this for the long run. I've packed my scale away, and my body fat calculator. Just going to ride out July and not weight in until August. I still do have confusion too about the fitbit, Scooby's, MFP, addng back exercise too. Can't see to get a completely clear answer. I'm a very active mom, so My fit bit is estimating an average burn of 2800 calories. That is ALOT, and I only burn about 350/workout. But running after a two year old on the baseball parks burns a lot of calories.

What I am doing this week is cleaning up my act. I'm only eating what I KNOW the measurements of. No more guestimating. I'm pretty much sticking to protein, brown rice, sweet potatoes, and a green veggie. I will keep you posted on my progress. P.S. I sent you a friend request! Let's hang in there.

MFP is estimating non-exercise maintenance (or non-exercise TDEE) from daily activity level you selected. You had to be honest.
Take off deficit you selected, whether reasonable or not was your selection.
If you exercised and logged it, that obviously increased your maintenance and now TDEE included exercise.
Take same deficit off, up to you to meet that goal.

Scooby is estimating exercise included maintenance or TDEE by your selection of activity level for the week, averaged out to daily level. You had to be honest.
Take off a 15% deficit, however many calories that is.
Eat that daily.

Those 2 method can add up, on average for the week - almost exactly the same - if you were honest and selected reasonable weight loss goal on MFP.
Just depends on if daily number is easier, you like changing number, you want same deficit amount daily by different number, you will do workout, workout is consistent, ect.
Pluses and minuses to both.

Fitbit is taking the MFP concept of daily activity level - but instead of you guessing correctly for non-exercise and logging exercise correctly for calorie burn, it supplies MFP with what you appear to have actually burned daily, then MFP increases it's daily maintenance and takes the deficit off.
So changing goal just like MFP does.

But you still need to log non-step based activity it's not doing correctly.
And you would still need to take a reasonable goal loss amount.
So 2800 x 15% = 420 deficit. So you could take the 1 lb weekly loss goal, and be less than 15% on big exercise busy days, and more than 15% on slower rest days.

So basically instead of you guessing between 5 rough TDEE levels - it is giving you daily infinite levels based on actual activity.

Did you guess your TDEE level to be near the 2800 it actually appears to be?
Because if you guessed lower, and then took 15% off - you are actually causing a greater than 15% deficit - right?