[ubuntu] Weird graphics on windows

I installed ubuntu-22.04.1-desktop-amd64 on VirtualBox-7.0.2 on my pc with Windows 10, following a tuto.
All went fine, except on some windows, for example the "save as" popup of Atom or other type of modals, which are completely unreadable :

Did you get this kind of problem already ?
What can I do to solve it ?