Hey Aggresivenapk1n,
Try deleting your camera actor and adding a new one, and be sure the ‘Transform’ is set to ‘Relative’. A good way to troubleshoot this issue would be to have a look at the vehicle blueprint of the ‘Advanced Vehicle’ template. I am assuming this is the project template you are working within already, so that would be a good place to reverse engineer to see where your blueprint differs from the default vehicle blueprint.
Use the image below as a reference for places to check where your camera rotation could be getting overridden or changed.
Vehicle Blueprint
I have highlighted areas of importance which can affect rotation of your camera. Let me know if you figure out the solution or if you need further assistance.
Cheers,