Bug with flash on towers

This bug occcured on the live server (EUW) with Lee Sin (I don't tried with other champions) in the practice tool : It ins't a huge problem at all but just to point out they are some weird interaction that could maybe lead to others plroblems in other scenario.

Description : When you flash on a Tower, Inhibitor or Nexus, (with the cursor on the tower) sometimes your champion will go to the last place you told him to go before Flashing, sometimes in the ennemy lines if you just wanted to fall back. I tried it several times and it happend 1 out of 3 times aproximatively.