Hi,
I found that the function ‘Set Position in Viewport’ for widgets is resetting the anchors values. I attached a project to test on your end. The Actor ‘AddUI’ creates and adds the widget to the viewport. Then it prints the anchor values for the widget, sets the position to 0 and outputs the anchor values again.
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This bug seems to be back in UE 5.0.3.
If I set the position it is always from the top left corner, though setting the alignment does work. Obviously not the intended purpose or ideal work around.