The table is not at 90deg, when you cut it to meet the star facets its not cut deep enough on the 5 sided facet side.
I’ve never used an Ultratec, so I don’t know what stop system they have. But you can check the 45deg adapter is set correctly by putting some paper on the lap and ink on the adapter. With the stop set for 45deg lower the adapter till it touches the paper, the ink should wipe off evenly. If not then adjust the stop/cheater till it does.
Depending on how accurate you want the star facets to meet the table you may find you will need to fiddle with the stop and cheater anyway as you get to the pre-polish stage.
Hope this helps.