It would help if you could attach your .rp file.
In general, yes, each repeater row has a local (x,y) coordinate. It sounds like you are moving widgets within the repeater, so that shouldn't matter, because you can't move them outside of the repeater. One thing to double-check is that you are using "move to" and not the default "move by" in your Move statement (easy to overlook.)
If you are moving widgets which are outside the repeater, you can use the repeater's (x,y) coordinates and the repeater row's index to offset the final (x,y) of the widget so its position is relative to the repeater.