I'm running a Spigot 1.9.4 server, and whenever a skeleton shoots a player, it just bounces off of them. This does not change regardless of whether the player is OP or not. The co-owner and I think it may be a plugin causing the problem. The plugins we have: CoreProtect, VoteRoulette, WorldEdit, ESsentials, CapsBlock, GroupManager, AntiSpawnEggs, ClearLag, Votifier, Worldguard, Multiverse-Core, ProtocolLib, NoCheatPlus, Lockette, RedstoneClockDetector, Elytra, SuperVanish, AntiInvisible, GAListener, Vault, TitleManager, MyWarp, Orebfuscator, MCBans. In advance, thanks to anyone who helped.