Men's Pants - unfortunately with a small quality defect

The fit is just as well as the material super. After unpacking I have the goods checked and no defects found. Of the 4 ordered Pants I've worn a. After a Tragetag already the seam opened the gusset approximately 3 cm. Despite the rather low price, something like this should not happen.
After I tested all 4 Pants, I'll adjust the star. Should there have been an exception, I freely admit even the 4 Star, but in case of recurrence, I prefer from even 2 stars.
So far, so no recommendation to buy from me.

Update: are the 4 star because all the other boxers are in order, the feel for the price is more than ok, even after the first wash. No pulling up the leg approaches during wear, as I know it from cheap goods. Everything stays where it belongs. I would buy again!