MPLAB not accepting some character from keyboard - keyboard

I am using MPLAB X IDE 4.15. Everything is working but I can't type the letter t e r. Although I can copy and paste these letters. It seems weird and I have no Idea why my IDE is behaving like this. Can anyone suggest me a solution for this? Thanks
Note:- I can type T E R but not t e r.

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I have an "Alt Gr" Key right of my spacebar. I could imagine using it + some key to get another symbol. Alt Gr + U = Ü for example.
Like this, i could also add other symbols i need from time to time, especially mathematical symbols or greek letters.
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