Low OPQ Storage room Cellion bug

Description of the bug: (optional screenshot/video):In the Opq map 'Tower of Goddess <Storage>' the Cellion that is supposed to spawn all over the map in a set order, has bugged out in 3 runs in the last few days. It either glitched out of map or dropped down a platform and since then no further Cellions would spawn to clear the stage. Didn't get a chance to record/screenshot.
What is supposed to happen?: Cellion is supposed to spawn in a set order over the platforms around the map and drop the 'Statue of Goddess : 2nd Piece' upon killing the final spawn.
Where did you find and/or notice this bug?: In OPQ map Tower of Goddess <Storage>
A step-by-step guide to re-producing this bug (optional): It's happened a few times seemingly at random, but every time it did happen there was somone lagging in party, but most runs had no issue.
Extra information (optional):I (Jatizso) have @GM'd all 3 occassion 2 of which had been resolved with GM help, the 3rd was left unanswered, and I am as of now unable to OPQ anymore since I have overleveled.