Void (Beta Build)

Alright, that should rule out it being a weird physics issue or being lag interferring; the next suggestion I have is that it could be something to do with movement inputs being messed up. Are you playing with a controller, or mouse-and-keyboard? If you're playing with a keyboard, and a controller is plugged in, it could be causing additional inputs that are cancelling them out or something so I'd suggest removing said controller.

If you're running this with just a mouse and keyboard and are having these problems, you may want to look at the inputs and remove any settings with 'joystick' as an input, because something could have gotten crossed somehow??? Or at least checking to make sure 'Horizontal (+)', 'Horizontal (-)', 'Vertical (+)', and 'Vertical (-)' are properly assigned to what you want it to be set to (these are the movement inputs).

The game is only really tested to run with a wired Xbox 360 controller by default, and I know the input mapping for other devices tend to be entirely different. That being said, when testing it using a PS4 controller, I had to (and was able to) manually change the inputs to work properly with it.

On the Unity start splash there's an input panel, and the likely problem spots to look into are 'Vertical' and 'Horizontal' (the versions with Joystick X, Axis Y). Double click those and manually input the joystick controller direction you want to correspond with moving vertically and horizontally on your controller.

Finally, if there's an issue with the controller's camera rotation, you can change those as well; those are titled 'Controller Camera Use'.  I think it's ordered 'Horizontal' followed by 'Vertical', but I unfortunately didn't properly label those ones, so if it's not that just reverse the order.

Thank you for your patience, and good luck! Hopefully one of these suggestions will help resolve this problem, because honestly I'm running out of both possible fixes and theories on what's causing it if none of that helps.