We found the source(s) of the issue and we're working on resolving it.
So far, this happens if a character tags out after getting hit from behind by Inferno of Leviathan. There may be other ways to cause this, but for now, Inferno of Leviathan is the biggest culprit. I'd recommend removing this from your Squigly's in the meantime while we work on a fix.
Thanks!