What mouse model? Connected directly or through some sort of hub?
cheap mouses, model I will check at home, if there are any label. Connected directly. The same issue on all USB ports.
The same mouses I tried on Peg2, IMacG5 and bananapro and it works.
If other people have no this problem, it points to mouses. I will test some other mouses with my Pmac and Pbook and let you know. And try connect with powered hub.
AmigaOS: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, AmigaOneX1000
MorphOS: Efika 5200b, Pegasos I, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad