It is quite normal!!! Some days nothing will go together right and other days they will practically put themselves together.. On the bad days if I have to rip it too often its best to just walk away for awhile. But try to figure out what the problem is before going on. Are you doing something wrong, is your 1/4 seam correct, is your pattern correct, or as is my case usually just have HUB syndrome going on!!! (head up butt)