Weird Switch Pro Controller Drift

[gurt]

I just got a brand new Switch Pro Controller the other day, and noticed something really weird. The right stick drifts... but only after I press a button. I connect the controller either through bluetooth or USB, and it's just fine. But after I press any button, the mouse immediately starts moving on it's own unless I hold the stick slightly up and to the right. I'm not sure if this is a problem with Steam or Windows or what, but I know it's not the controller. My other controller did the exact same thing drifting in the same direction. Any help would be appreciated.

[Ruse]

There are drift issues on the nintendo controller products.

[More Stoned Than Willie]

I have been using a Switch Pro Controller for a couple years now and not had any issue until about 3 weeks ago. I am getting a constant false backward input from both the left and right sticks. I bought a new Pro Controller and out of the box within 15 minutes was having the same issue. I switched to my Xbox 360 style Logitech that I normally only use on Epic, and it also had these same input issues. Wondering if you are having the same trouble? Have you tried another controller?

[gurt]

I've done some experimenting with various Steam Controller configurations, and my problem seems to lie where Steam handles the joystick mouse. It doesn't drift in-game at all, but the joystick mouse does. Disabling joystick mouse solved my problem completely.