Hey only just had a chance to look at this - it looks like if the swipe velocity was lower than the scroll threshold it could start moving + click at the same time. The whole thing really needs a rewrite at some point, its not ideal how it does some things in there (eg. velocity drop instead of exponential decay to spring into place, but thats a story for another day).
Line 454, tk2dUIScrollableArea -
else if (swipeCurrVelocity != 0 && isSwipeScrollingInProgress) //velocity scrolling
Add the condition to only swipe when velocity > 0, isSwipeScrollingInProgress only becomes true once the touch is cancelled. It should help in your case.
It doesn't happen anywhere near as frequently as it does for you, for me its like 1 in every 20 swipes. But that could be down to framerate, etc.