EOS + l33t quest

Mac Steam player.
I failed custom l33t arena with max difficulty. After that I went to fight EOS & successfully killed eclipse. But after 2 phases EOS decided not to appear for the last time & infinitely spawn difficulty 9 glitches. Killed 7 Ultimate Badasses, spent 15 minutes, got bored.
Saved & quit, nothing happened.
PLEASE FIX.