Turret respawning bug

[tmm3k]

I was playing a few minutes ago in tbd_grotto, and I had just destroyed one of those high up turrets. Got the XP for destroying it and everything like usual. About a minute later, I see the turret is back with about 10% health left. Not sure what the deal is, but destroying it again made it go away for the rest of the round at least.

At first I thought it was just lag, but I remember seeing the little 11+ pop up (10 xp for destroying, 1 xp for damaging), so the server clearly recognized I destroyed it.

Any ideas what happened?