Why does Photoshop resize the view on all open images when magnifying just in one.

Hello everyone,
since one of the recnt updates I have no serious but a pretty annoying issue. When I have multiple photos open and use the magnifier only on one, it involves any open picture (shown or blended off) but just when zooming in, no matter if I use the tool or keyboard shortcuts. Zooming out has no effect on the other pictures and they reach pretty ridiculouls magnifiying scales. Any idea if that is a bug or some new hidden function which is activated unwillingly after one of the recent updates?

Thank you