Semi-normal, lol. Stuff like this happens when triggering a scene or movement of the camera/images while the last movement is still playing, is a common thing on RenPy games with lots of camera movement. Also happens when you save/load a file while there is something in movement.
I recommend to backtrack in these cases, and not skipping too much/tapping too fast.
Also, 0.1.11 is out! lots of bugfixes