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The document should snap to center when the whole document is revealed whether zooming using Ctrl (Cmd on Mac) plus +/ - or using the Zoom tool. Did you try the other if one wasn't working as expected?
I'm on Windows 10, sorry for not saying so.
I use CTRL + SCROLL WHEEL when zooming.
Anyone know the problem or am I suddenly doing something wrong?
Does it still happen when using Ctrl plus + or -?
Might either be an installation issue or a graphics driver issue. Try updating your graphic adapter's drivers if you haven't done so recently. If that doesn't work, try an uninstall and reinstall of Photoshop. (Wipe all preferences when it asks. You'll have to rebuild and reset everything the way you had it.)