When I make a new line when I type, it makes a new line but it floating below the first line. I have to press enter 3 times to get the actual new line. I didn't have this 2 days ago.
I tried different things but no idea.
2 days ago it was completely fine but doesn't work now.
You have likely changed the Leading value in your Character panel.
The quickest way to return all the Character parameters to defaults, then start afresh changing font, etc., is to do the following:
1. Select the T (Horizontal Type) Tool.
2. Right click on the T at the left end of the Options bar.
3. Choose Reset Tool.
Alternatively, you can make the Character panel visible, and change the values there to what you want.