I added this mod with Quark (and tested it with my other mods to make sure it was Elemental causing the issue). Adding it removed all the mob skin variants on mobs. I am unsure what I should add to help solve this issue but I'm happy to add whatever is needed.

• Version info: 1.20
• Other mods:
  alexsmobs-1.22.9.jar
  amendments-1.20-1.2.18.jar
  another_furniture-forge-1.20.1-3.0.1.jar
  ars_additions-1.20.1-1.6.7.jar
  ars_elemental-1.20.1-0.6.7.7.jar
  ars_nouveau-1.20.1-4.12.6-all.jar
  balm-forge-1.20.1-7.3.16-all.jar
  biomemusic-1.20.1-3.4.jar
  citadel-2.6.1-1.20.1.jar
  cluttered-2.1-1.20.1.jar
  configured-forge-1.20.1-2.2.3.jar
  cupboard-1.20.1-2.7.jar
  curios-forge-5.11.1+1.20.1.jar
  Disenchanting-forge-1.20.1-2.2.4.jar
  embeddium-0.3.31+mc1.20.1.jar
  geckolib-forge-1.20.1-4.7.jar
  getittogetherdrops-forge-1.20-1.3.jar
  Jade-1.20.1-Forge-11.12.3.jar
  JadeAddons-1.20.1-Forge-5.3.1.jar
  jei-1.20.1-forge-15.12.2.51.jar
  journeymap-1.20.1-5.10.3-forge.jar
  JustEnoughResources-1.20.1-1.4.0.247.jar
  lootr-forge-1.20-0.7.35.90.jar
  moonlight-1.20-2.13.65-forge.jar
  NaturesCompass-1.20.1-1.11.2-forge.jar
  notenoughanimations-forge-1.9.2-mc1.20.1.jar
  oculus-mc1.20.1-1.8.0.jar
  Patchouli-1.20.1-84.1-FORGE.jar
  polymorph-forge-0.49.8+1.20.1.jar
  Quark-4.0-460.jar
  right_click_get_crops-1.20.1-1.6.0.12.jar
  supplementaries-1.20-3.1.13.jar
  travelersbackpack-forge-1.20.1-9.1.16.jar
  TreeChop-1.20.1-forge-0.19.0-fixed.jar
  waystones-forge-1.20.1-14.1.9.jar
  windowlogging-renewed-1.20.1-1.0.0.jar
  Zeta-1.0-24.jar

are you sure it's consistent and not this matching this bug report?
VazkiiMods/Quark#4605