Birddogs Long Gym Shorts with liner 9 inch inseam in light grey size small

Birddogs Long Shorts with liner 9 inch inseam in grey size small Faint mark shown next to stitch on the back of shorts. Not sure if that stitching is supposed to be there. Measurements Flat waist: 13“ Inseam: 9“ *all measurements approximate* *measurements may vary on how much the item stretches*