Can't throw out cards on iPhone

I'm using angular swing in an ionic app. It works perfectly so far. But currently I have the issue that I can't throw out cards in any direction. They just snap back. I only can throw cards out, if I touch them on the outmost edge in the opposite direction of which I'm throwing.
Is it possible to set a minimum distance a card has to be dragged to count as thrown out?

I hope I expressed my problem correctly :)

Thanks in advance!