JOSM: How can I avoid crashing font size and symbols?

I have recently started working with JOSM. When I start JOSM on one of my computers, everything is fine. After saving or opening files, font sizes and symbols in menus or dialogues double or triple in size, which makes working with JOSM nearly impossible.
Error in Java? But how can I change the behaviour of JOSM?
More information needed for helping?
Using Win11 Home
Thanks for any help!

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