Phone adds clicks/touches always at the same place

A

AC Question

First time i noticed it in fb messenger where when i type it sometimes click on the call button which makes chatting frustrating.

Later i noticed in clash of clans game it sometimes adds click at same place of screen as in fb messenger.

Later i noticed it happens randomly, but only when i use screen to (pressing screen), and always at the same place - upper right corner of the screen.

I TRIED NEXT THINGS (nothing helped me):
1. Restarting phone
2. Device Diagnostics Tool (did screen and touch test, everything's fine)
3. Simulated battery pull
4. Safe mode (tested typing in message app and it added clicks)
5. Factory reset
6. Removed on-screen protector and cleaned the screen
7. Removed mem. card and sim card

My phone is Sony Xperia C5 Ultra Dual.
I i'm so desperate for help, any ideas how can i fix it?