Encounter Builder issue

I am currently having an issue with Encounter Builder as I went to resume an encounter and I got blanks in my monsters and when I tried to edit or redo them the monsters still don't show and it's only for ones that I've used before. I can seem to make other encounters with different ones.

update: now I can't delete or save new encounters

I've been experiencing this all day as well. Old custom monsters no longer appear in encounters when started. The message says "error finding monsters".

Yep Yep that's what I'm getting too

I've been getting this when I add some monsters to an encounter - the ones I've found that break it are: 

Cloud Giant Ghost
Loup Garou 
Gremishka 
Boneless
Carrion Stalker
Carrionette
Greater Starspawn Emissary

Not all of VRGtR creatures break it for me, and most of the Candlekeep ones are fine. 

I'm running Chrome Version 96.0.4664.45 (Official Build) (64-bit) 

I am having this issue with a couple Candlekeep monsters - Immortal Lotus monks, Bak Mei, and Canopic Golems

I am finding for now that any Candlekeep Monsters and My Homebrew Monsters are not working 

Same as OP for me, all of my encounters will not load and only give me the message saying "error finding monsters".

Ok have done a recreate of monsters in homebrew and now only a few of the candlekeep monsters give me the error but would really like to know why this is happening (shouldn't have to recreate homebrew or make a hombrew for a already existing monster just to use Builder)

My issue has been resolved.  Hopefully, it's fixed for everyone.