Vidarr:
For me it's strange that I'm getting fatter but without any weight gain.
I mean I'm getting bigger but the scale isn't showing it.
Why is it so?
Munchies:
Fat isn't very dense, so you can gain a bit before you get heavier. Also, you may be losing muscle mass. Muscle is very dense, so you can gain a lot of muscle without looking much bigger.
Vidarr:
I'm pretty sure that I'm not gaining muscle mass because I'm very sedentary and I noticed, lately, that I struggle more with certain daily tasks that I wasn't struggling with before. So It is bad to gai fat and lose muscle?
If you want to gain comfortably, yes. Not only does muscle contribute to your overall weight, but it makes certain things easier and you grow.