AMDGPU-PRO 16.60 problem

Hello, I am new to this forum.

I wanted to try out CS:GO on Linux and I chose Ubuntu Mate as my OS.

I installed the latest amd drivers and followed the instructions to do so. When the installation was over I restarted my PC and then these bars appeared on both sides:

I used my phone's camera because they don't show up on the screenshot that I took.

When I uninstalled it, they disappeared and after the reinstall they appeared again.

Can you help? Thank you!