What are yout View > Snap, View > Snap To and Photoshop > Preferences > General > Snap Vector Tools … settings?
"Snap vector tools and transforms to pixel grid" settings is checked.
"Snap" is enabled in View.., and "Snap to" is Guides, Layers, Document bounds... and Grid, Slices seems checked but disabled.
I disabled "snap to layers" and its much better now.
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Yes, snap to layers (shown when using smart-guides can be useful) might trigger the issue.
Remember that the CTRL key temporarily disables snapping.