Echo of the Sun Glitch

Bug Name:

Echo of the Sun Glitch​

Bug Description:

I was doing some Echoes of the Sun with a few friends, and about 9 scrolls in we got no monsters, just a bunch of imps ran out. We killed all the imps, then it gave us a message, and nothing spawned. We waited around for about 30 minutes, and nothing spawned the entire time. Then we broke group, I logged out, restarted my computer, and logged back in. Now I'm trying to put together groups and it tells me I'm in the middle of summoning a boss. When I go back and try to summon to break the cycle, it tells me that the boss has already been summoned. I've restarted my game and computer multiple times now, and I'm stuck permanently summoning the boss.

Please help! Any fix?​

How to reproduce/proof:

I have screenshots here, I don't really know how to recreate it:

https://i.imgur.com/016O7Sr.jpg
https://i.imgur.com/uT11AIV.jpg​