Hmmm...wonder if there is an issue with only clamping on the one side.  I did try to hold firmly to the jig, but that could have been lacking (picture with jig when I was cutting the lip that went into the groove


Actually thought I should cut an opening so I could feed thru a clamp, but was too focused on getting the top done. 😬🙄

I didn't get to the sanding today as I was trying to figure out the cross size.  Not sure if I'll do an inlay or place on top.  This was just some scrap wood to work out dimensions.