GPU usage is unstable and low

I accidentally posted this in the wrong section, so I'm going to post it here again. So this is my problem:

So I've had this happen in other games but this was caused by vsync and freesync because of some frame limiters that go with it and when I turned those off it was fixed, but it still happens in Beamng. I've tried looking into it and see if I could fix it, but I couldn't

For information purposes:
My GPU and CPU usage (i only checked 1 core) is about the same, they both sit at around 48-60 % usage and go up and down from there, I checked it with afterburner

My GPU is an RX 5700 XT and my CPU is a threadripper 1920x which should definitely be able to handle my GPU and this game.