Caitlyn Ult bug [Gamy Play]

Okay so recently I saw on youtube a video where a caitlyn ult went through three champions to hit the intended target and kill it. I thought "oh wow that was dumb hahahaha." Until that same thing happened to me and my friend twice in one game. My friend was being caitlyn ulted and i stood in the way yet the ult went directly through me and hit my friend. Then later in that same game I was being ulted and my friend flashed into the way (well in enough time to block it) and it went through him and killed me. So now I think this might be an actual bug that should be fixed. Please look into it!!!!!