Cassiopea Ult Bug

I was playing a game as Cass and ult'd their team under turret. I did not flash or cast any other abilities before it so not related to how the cone abilities sometimes change direction; should not be at least. Anyways 3 were in front of me facing me, 1 was facing away from me, and 1 was not in ult at all. None of them took damage or were stunned by the ult. The Nasus was about 1 minion space away from me directly in front of me and was facing me getting ready to Siphon strike since just in range (so I think that is 125?) and he was not stunned which this also confirms he was within range so I could guarantee it was not an accidental misjudge on my part of range. This led to us losing that teamfight and immediately losing afterwords too so was a dramatic thing.