Full screen and superposition

Hello everyone
I have a problem with full screen display.
I have multiple layers
including two overlapping regions
In one of these regions that appears above I put a subplaylist that contains 5 videos.
I configure one of these videos to be displayed in full screen but it appears in the center of the screen not in the original region and not in full screen when I remove the full screen mode it returns to the original region

otherwise the rest of the regions appear normally in their place on the whole screen
I am using version r.2.525.5 the video is in 1080 and the screen too