I have been merrily weaving along and just noticed that the left selvage has taken a significant dip! I have made a few clergy stoles using the same warp & weft yarns and did not have this occur before. I unwove 12" or more trying to find where things went wrong. I got back to a place where the weft appeared straight but the dip shows up as I reweave. It is really noticable within a few inches of new weaving. Should I just start over? Hang weights on certain warp threads? If so, which ones? Thank you for any suggestions/assistance!