Mina's ult bats misses while in multiplayer

[mattri]

I noticed while playing mina in the lobby that if you're alone, with no one in the party the bats from nox nostra have auto aim/follow enemies like its supposed to do, but when a friend of mine joins the lobby the bats stop aiming onto the enemy like it did, resulting in missing from 50% to 70% of the bats.