[astra]

It is very important to know what you eat.

For example (just for argument sake) if you eat meat 300kcal and bread 300kcal. You will get fat from the bread but much less from meat, although the raw quantity of calories looks the same. It depends on what the calories are made of. Your body will keep some and put some in places where you want them the least. So, your overall weight might be the same after both meals, the amount of fat will differ.
It also depends on how often you eat.
Our body is used from primordial times to save fat for cold periods. If you eat 2-3 times a day with bug time gaps, your body is entering a life saving mode when it thinks that food is hard to obtain, so let's put away those calories in the form of fat just in case. If you break your meals into smaller portions and consume them more often, the same amount of calories will be used more wisely by your body.
Even how you exercise will affect your fat and weight.
You might build muscles but still retain all the fat or you might burn fat and only strengthen the muscles.

You have to think about lots of things. It is not a straight forward formula 3000kcal in, 3300kcal out = loosing weight, loosing fat. If you do something incorrectly you might loose weight, but instead of loosing fat, you loose muscle mass.