It sounds like you are applying the rotation to the root component of your actor regardless of the direction of rotation. Perhaps you made your camera the root component.
What did you want to happen?
I would have thought you would want:
- camera yaw to rotate root component yaw in the world (to let the entire character physically turn left and right relative to its forward vector)
- camera pitch would be applied to the character’s head’s relative rotation in local space ( head tilts up and down)
- and of course there is no camera roll