I can confirm that the same bug is happening to me also.I created this account so that i can report it, just because it is so annoying.It happens with the axe and pretty much with all melee.Also it sometimes happens with automatic guns-rifles.Its happening to me since 0.53 and still today.I can make it stop by pressing the left click on the mouse or with spacebar(sometimes works) but when u ve got an automatic in your hands you cant do anything to stop it.