Issues with Cameras

Hi, I want to report a glitch I have been dealing with, it’s when I create and animate a camera for a scene.
I can’t seem to change the camera view from the selected camera to another view such perspective, top, front and right. It seems that it’s locked and I can’t change it.
The only way I can get out of it is to delete the camera and then I can use Perspective.

Has anyone else had this problem?

In latest Machinima ver. 2021.2.0
I do not have this problem:

Yeah I did a practice run too and it worked. It seems to play up when I’m working on my project. Would it have anything to do that my scene comes from Unreal?

Man, it must be that.