I had a fun experience today
map spawned two set of bosses. Not common at all I think, but it forced me to make an account finally
I was playing GDX4-Crane by myself and last two gates were Torchurer and Mullog. I used the Hyper-Flakker's secondary fire and destroyed he Torchurer gate. Then the bosses spawned. I thought it was strange because I had 2 gates left but it only showed me killing that one.
Then I walked forward past the crates and saw there was a Mullog gate was still alive and killed that, and then the bosses spawned again. I think I had to kill 13 bosses before the game completed.
Here is screenshot of the log.
Didn't get chance to get anymore because time was running out and there were so many bosses