Hi! Sorry for the hassle. This “drifting” is usually caused by the controller still sending input even when you use keyboard/mouse.
Quick fix: please unplug/turn off the PS5 controller completely and relaunch the game, then test with keyboard + mouse only.
If it still drifts after these steps, please email us at info@gayeti.com
with your setup (controller model, Windows version) and we’ll dig in. Thanks a lot! :D