Act 3 The Matlan Waterways Beachguardian The Brave

Hello, not sure if this is a bug or not but in The Matlan Waterways a friend and I have a miniboss spawn named Beachguardian The Brave. The issue is every time it is destroyed, it respawns with a new spirit animal buff in addition to the multiple ones it already had. Each time it dies and respawns it also becomes significantly more powerful, now to the point of not being able to kill it. I attempted to capture a screenshot but while writing this email, the map reset and gave me an error upon trying to re-enter my portal.

Thank you,
Gallataki