Parsec Constantly Pressing or Scrolling Up

If you're experiencing this, it's usually because you have a controller that is pressing up, be it a physical controller or a virtual one. A very common culprit is older versions of vJoy. If you have vJoy, uninstall it or get a newer version.

Alternatively, for any kind of controller, if you're logged in, go into Parsec's settings > Gamepad and click Unmap on the input that is stuck so that Parsec stops using it.