Is the cut actually off? (when you cut it)
Don't trust what the preview in VW looks like, the resolution is a joke.
did you get the problem sorted? sometimes when you zoom in on the cut line in versa works it appears not to be correct, or alittle off, but when you go to print its ok. the picture of the "job" in the viewing window in versa works always looks really bad/pixalated!
strange if the yellow on only some of them is off. did you create the star design and then copy and paste and then resize it?
if you take out all colors....and work in WIREFRAME..... then you can see ALL THE LINES...and delete the ones you dont want it to cut, THEN ADD THE COLOR ))))
if the design is the same apart from just the sizes and the cut contour looks good in illistrator, then it should be the same in versa works.
if the cuts are getting off when it cuts on the printer than yes, maybe the material is moving. are you using media clamps? are you using the pinch rollers?
are you printing, then laminating?
How much bleed are you using?
Have you done a print/cut calibration recently?