So I posted already something about chicken, it seems that I have the same problem for all mobs. Whenever I make a farm, let's say cavespider or blaze farm, mobs start glitching out into the walls. Seems that they cannot be in the same spot when dropping on eachother from above. I've downloaded my map into SP and everything works fine. Another weird issue happend with chicken for a breeding farm: they start flying into the walls and sometimes they glitch out the fances or walls so they can run away. At the moment I'm testing if this has something to do with plugins. But if not I think it's some kind of bug. this are my server details: Code: ------------------ Server Information ------------------ Java : Sun Microsystems Inc. 1.6.0_23 (http://java.sun.com/) Operating system : Linux 3.0.0-14-server (amd64) Available processors: 2 Free memory : 618 MB Max memory : 910 MB Total memory : 910 MB Server ID : unnamed Server name : Unknown Server Implementation : git-Bukkit-1.0.1-R1-b1597jnks (MC: 1.0.1) Player count : 2/20 ------- Plugins ------- Permissions : 2.5.1 WorldEdit : 4.6 Rakamak : 3.6.1 NoCheat : 2.21a GroupManager : 1.1 (Phoenix) CivilizedSpawn : 0.8 Announce : 3.0 Backup : 1.8.4 Lockette : 1.4.4 PvP Control : 1.5 AutoMessage : 1.5 SpawnMob : 1.9.8 Multiverse-Core : 2.1-b326 WorldInventories : 1.0.0 SpongeRestore : 1.1 WorldGuard : 5.2.2 EndReset : 0.1 Essentials : 2.6.4 Multiverse-NetherPortals: 2.1-b283 iConomy : 6.0.7b EssentialsChat : 2.6.4 SignColours : 0.3 EssentialsSpawn : 2.6.4 EssentialsProtect : 2.7.1 EssentialsGeoIP : 2.6.4 ChestShop : 3.24 Hope anyone knows a solution.. thanks, zip So I filmed the bug I mean: sorry for the low fps btw zip EDIT by Moderator: merged posts, please use the edit button instead of double posting.