Misses half of pull ups

Rather annoying to use since it doesnt recognize around a third to half of pull ups. Im having to wave my phone around to complete the workouts. Would be better if you could manually mark them as done when that happens. At present Ive stopped using it. Its not like I can do an extra ten just to make it happy.

fullgamut about Runtastic Pull-Ups PRO Trainer, v1.4.1