A new APQ glitch?

I APQ'ed just now, and in stage 1, monsters just kept spawning. Even after we killed them, a few more would spawn. Eventually the leader managed to click in a second that they were all gone (We were all running around killing).

Has anybody else had that happen? o_O

This had happened to me a few times..

That's really really old. We used to call it Slow Spawn Glitch. Not that bad I guess..