Most likely a measurement issue----if your hips are larger than the kilt is built for you (ie you are actually a true 38 but the kilt hip is built for a 37 or 36 instead) you will get that "flying" pleat of the first pleat at the reverse pleat. A sign that you have recently gained weight or that you need to use a slightly higher hip measurement next time you order a kilt.

It can also be brought on if you tighten your bottom right hand strap too tight, which mimics having too small of a hip built inot the kilt. So try that first.

j