You haven't said anything about what your system is, what OS, what extra hardware you've got attached (apart from the gaming mouse).
No idea what's going on here. Could be as simple as you haven't got the correct drivers for your mouse. The auto-typing thing looks like a form auto-fill, but has only been noted a couple of times with iPads.
Check that your hardware is Microsoft-compatible, check you have the correct drivers, and check for driver updates. Run Malwarebytes just to be sure there's nothing unwanted on your system.