Dear altruno,
It sounds to me that it is just a screen refresh problem. If on Layouts it appears fine, I think there's nothing for you to worry about.
You can try the same file on different machines, to see if it is a computer specific problem, or that project works like that in general. Maybe your video card has trouble redrawing something, try turning 2D Hardware Acceleration off in 'Work Environment>Advanced Redraw Options'.
If nothing helps, and the problem becomes severe, the best would be if you could contact your local ARCHICAD support team, or if that's not possible for some reason, send me a video of the issue, and your PLA in a Private Message, so that I can take a look, and see if I can help.
Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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