I can't really show a picture that would show it well, but sometimes when I click and hold in a direction it moves the opposite way. When I just tap on a spot it flips me the wrong way for a second and then moves me in the right direction. I usually can't attack or pick up consumables when this occurs. 

Just an observation, but it only seems to happen when there is food from food reserves. Could just be a coincidence but it also happens when other players have the food reserves instead. Possibly consumables as well.