[GAMEPLAY] Weird Sion Ult

I had some games yesterday with Sion and had some bugs with his ult. First off i used my ult while standing right in front of a Diana just for the short cc... I was standing pretty close maybe that is why the problem occured. Here is what happened --> I hit her with my Ult and wanted to continue with some abilities but actually i was stuck in my ult... I could neither use anything nor AA. I found me in the ult animation with that arrow in front of sion heading to a direction. The champ was walking in normal speed but allways towards my cursor althought i wasn't clicking... It ended when i dies and went into passive which is a long time til then as sion ^^

Hope is gonna be fixed