rviz elements sometimes gets blurred

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I am running ROS from a docker container. I am also using Rviz and sometimes I notice that some elements of Rviz get blurred.

Like for example I am operating the system and I want to open a menu, so when I click on the menu, a blurred image pixels appear instead of the actual menu. Or if I want to open an rviz file, instead of the explorer window a black window appear.

The funny thing is that the functionality is still working so if I know where something is I can click on that and say-open a file for example. It is just the display that gets blurred.

I will try to get an image when I can. I wonder if this happens to any of you and how to solve it