How to remove multiply mobs?

[sonic bough]

This is probably due some Anti-Lag, Mob-Stack or Skyblock like Plugin and not AureliumSkills
go through your plugin list and look at the wikis if some plugin mentions this feature there

[eager furnace]

I removed those plugins and restarted my server

[sonic bough]

Its then probably due to the fact, that the plugin edited the name of the cow. It wont do anything anymore but since the name directly got edited, the cows name is now "8 x Cow" until it gets killed. New mobs shouldnt be affected anymore