What's your average meal look like? Like, what foods are you eating?

Not sure how your fat content could be so high and your cals so low. Maybe start entering in your foods manually, or using the barcode scanner on the app? I haven't used it, but my meals average between 480-700 cals each, plus I have 100-200 cal snacks - which adds up to around ~1600 or so. If you're feeling good and losing weight, it's probably safe for you to just up your portions a bit.

I'm just skeptical of a lot of the data on the food database and I double-check everything. You could be intaking more cals than your diary is telling you - and anyway, once you get a good pattern going, cals are something that can fall by the wayside, as long as you are on top of your carbs/fats/protein intake. I have been going over on cals lately but hitting my macros everywhere else, and I set mine up to be at a 26% deficit to start.

See if your past diaries contain any questionable items - example: I had entered in some pepperoni once that someone decided was 6 g carbs for 8 slices - which, depending on the brand, sometimes processed meats can have a good bit of high-carb fillers and/or sugars in them...however, it was incorrectly entered by a user. Also, found an issue with a brand of eggs I buy locally. The Sparboe farms Grade A large eggs I would track into my breakfast were coming up as 3 g carbs EACH. I knew something was wrong and found the correct one, which was 0 g carbs per egg.

0.6 g actually - according to USDA (oops, I'm trusting THE GUBMINT, LOL)

But let's see how we can help the o.p.

How tall are you OP and how much do you weigh?

How much weight do you have to lose? Your body has stored "food" available. Let it use the stored food while your appetite is so low. I mean, typically, the appetite responds to need. Now that you're not feeding your body hunger hormone triggering foods, it's recognizing that there is not as much need for consumed food because now it is ABLE to use the stored sources so well in the new low insulin environment.
Your body is working perfectly. It's doing exactly what it's supposed to do.
The low appetite WILL NOT last. As your storage gets lower, your body will respond by increasing hunger. When that happens, you need to respond by eating more, even if it means you eat at maintenance for a while so that your metabolism does stay healthy.
Following hunger signals is a very important thing to learn for lifelong health and weight management.

I started on not being hungry low cal for 2 months but it ironed out. If I forget measurements on oil/ butter some days and that can mean under counting.

Listen to your body. If you are Not hungry don't force yourself. I did that at first thinking I had to have 3 full meals a day. It only made it difficult for me to tell when I was really hungry because I was eating by the clock and not by what my body wanted. When I caught on to eating based on my hunger, I started losing weight.