visual glitch when I paste pathes




for unknown reason, when I'm trying to duplicate these pathes from the same file or from origin file (2) to the other file, it looks like this and this extrafills can't be removed since there's no sucj things (3), aand attempt to refill it leads to this artifacts:

I tried restarting - it didn't helped me as well as pasting different ways
in a nutshell: I have this

but if I duplicate it, I get this

