Okay.

So a few troubleshooting questions:

When you try to rotate your camera in Zoom, how long does it take to revert back. Immediate, or some seconds or time later? 

What happens if you rotate your display in Windows - Ctrl + Alt + "Left Arrow" or "Right Arrow". Does your webcam view rotate along with the entire screen - or does it auto-adjust back to where it was? Ctrl + Alt + "Up Arrow" to restore your screen to normal BTW

Exactly what Lenovo model is your laptop - and does it have a touch screen?

Do you have additional monitors connected - and if so, could you try with the laptop just standalone?

What version of Zoom are you running?

Let's see if we can get to the bottom of this!

Rupert