'How to fix that shining buttons issue after compiling in Unity Canvas

I'm using some simple buttons in canvas in a 2D game, there is no light or i don't do anything via code for brightness of button. Buttons are shows normally in scene view, but these are shining in game view like putting a lights on them. What's the reason for this? How can i solve? You can see that what i mean on image below.

https://imgur.com/g0sQujE

I checked image attributes of buttons and camera render settings but didn't found anything.



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