Lightroom Classic: Zoom position gets changed (in compare view) when skipping one picture with the keyboard right arrow

Thanks for your reply!

With "zoom position" I mean which part of the photo is displayed (e.g. upper-right corner). The zoom level remains as before when pressing right-arrow.

I'm going to check your suggestions tomorrow and let you know the behaviour.

I recorded an animated GIF. The program focus is in the right picture and I'm only pressing right or left arrow:

https://1drv.ms/u/s!Aqnz4d61BlsrgpJOtH1KQsS-CM3KHw?e=gvVKXa

You can see that in both pictures the viewing position gets moved constantly.

Hint: The viewing position is not synchronized between left and right in that case.

Sometimes it seems, that there's an object detection that follows the bird!?

On the Tool Bar, in the Zoom Section do you have the Padlock locked or unlocked?

It is locked.

You can see it here: 

I tried to replicate the same steps you were taking, but the zoom position didn't shift for me. 

Let us know if resetting preferences fixes the problem.

Another thought: Is it remotely possible that the images that shift have different pixel dimensions, e.g. a crop was applied in-camera or in LR, perhaps by accident?   You can easily check that -- change the Info Display (type "i") so the pixel dimensions display.

The pixel dimensions are all identical.

Is there an object detection that tries to follow the object?

No object detection for zoom position.

Resetting the preferences also didn't solve that behaviour.