Only four towels today because...life. Some of the day was spent doing prep for the beginning weaving workshop this weekend. Five people in the class. DH came with me to the guild room and helped re-arrange everything because the room is so full we have to put stuff not being used away for workshops. Maybe I need to start buying lottery tickets! The room doesn't have a/c so I hope it's not too hot this weekend! :)
Like Sara says, the first thing to do is figure out why there is a problem.
What did you use during beaming to separate the layers? Was it sufficient to keep the layers from cutting down into the lower layers? Is there an even build of the layers? Is the edge 'collapsing' on that side, causing different tension on those ends? Did you beam with sufficient tension?
Are you pulling and plucking on the selvedge ends? If so, stop.
Are you seating the weft around the selvedge well? If not, the selvedge ends might not be taking up at the same rate as the rest.