Hm, by physical mouse this should not happen. If you press mouse wheel and hide double cursor then mouse works exactly like on pc. This was added in android 8. If this mode is active then all mouse events are sent directly to emulator. If you do not hide double cursor, then physical mouse works like touchscreen mouse and then yes, it can happen. But for every case, I can check it in fallout 1.
If you are outside emulator, in other application then it works fine? I think scummvm implements hiding cursor too.