Ctrl + . types underlined e

When i press ctrl + . it types an underlined e and everything i type after that is underlined.
I have looked everywhere and cant find a fix or even know what is going on.
It only does this in Firefox, text editor terminal and any other default things, applications like discord & chrome doesn’t have this issue.
I am very new to Linux in general (few months).

Its an emoji picker, if you press SPACE when you see the e, it should open the emoji picker.
Its a bit unpredictable & sometimes it doesnt work correctly for me.

The emoji picker immediately opens for me in Gedit just pressing Ctrl + ..