I was playing with a friend in the creeper forest, on PC, using keyboard. 
At the 4th run,
Sometime my character goes itself at the bottom-right side when I maintained my left-click button.
But I could click on the block I wanted to go, and it goes on the right block.
And If I was near an object like a door, my cursor didn't changed, and if I clicked on it, nothing happened.

I don't know how I made that, but it occurred until I closed my game.
I think my game considered that I clicked on an invisible block in the foreground.