I can't describe as a log what is exactly occurring. Please watch the video I
uploaded to try to describe it.

When I type an URL in the Firefox the search combobox shakes as well. When
resizing a window, as shown in the video, the problem occurs too. When
transparency is enable in Terminator, the bug blur all the window and when I
hold it with the mouse, the blur is gone. Type again and it blurs again. When
transparency is disable, it doesn't happens. In Konsole, the blur doesn't
occurs, even if transparency is enable.

https://youtu.be/drm_lHXTIBM