I am having problems with my sashing-- they are wavy as if I pulled the fabric when sewing them. They are more pronounced now that I SID beside both sides. I get mad but do need help to understand why and if I remove those SID stitches and stipple over it --will that hide the problem( the rest is all stippled) I have put it down and walked away but since it is for the local hospital I can't leave it too long.