I've been waxing 6 years and it does have its problems. Did a leg wax today and it had a few problems. Did the rest of my waxing no probs, so it shows you Sass it is leg waxing that I personally think can bring a few problems more than other body areas..
I would suggest don't worry too much, leg waxes sometimes arent the easiest of waxes to do.
If the hair is too long it won't adhere to the wax that well, if it is too short it won't either.
Sometimes the hair grows through at different times so there may be shorter hairs along with the long ones, hence the reason you may have a few short ones that haven't adhered to the wax or something.
Anyway probably covering old ground here lovey. Hth's anyway. xx