So I've tested and everytime it's pointed back at Epicfight and Dungeons Libraries possibly or dungeons gear. When removing Dungeons Gear this problem doesn't arise.

I'm unaware but my guess is: Out of the 4 mods making this happened it's probably Improved Mobs (adding the Dungeons Gear weapon to a mob), Epic Fight or an extension of Epic Fight (as Sao, EpicPirates, Weapons of Minecraft appear as EF and some of the Dungeons Gear weapons are added to those extentions) not working properly. I'm not sure if it's one of my Datapacks (weapon being added to a certain extension config.) It could be because an EF extension, could be enchant or item, possibly just an animation stance for a skeleton or zombie.

I'll test with setting Dungeons Gear items away from those extensions, then trying to block the enchants and as a last resort see if black listing enemies from spawning in with Dungeons Gear.

Just wanted to give a heads up! Thanks for the hard work and great mod!

These are the mods in question for 1.18.2
Epicfight 18.2 18.3.8
Improvedmobs 1.18.2 1.11.0
Dungeons Gear 1.18.2 4.0.2-beta
Dungeons Libraries 1.18.2 2.0.5-beta

https://pastebin.com/92h7PzYt

I also use a resource pack that fixes the armor to work with Epic Fight, it's a delight to see both work together so well! Sadly it's on PM, but maybe it can help with compatibility for a future version or for anyone that wants to use the two together and rock this mod's awesome armour!
https://www.planetminecraft.com/data-pack/epic-fight-dungeon-gear-patch/

edit: Welp found the issue, took the an old tester global pack I had for the weapon configs that tried to use EF's Saos organization for "sao_sword" it just does not play nice when adding to other weapons. Most likely a mob spawned with it and just completely broke! Hence "ef" animations! Sorry to bother, but if anyone enjoys EF and dungeons mobs hopefully they'll enjoy the resource pack too if they didn't know about it already!