FoXxNoXx

I enchanted my head armor and had protection 4, the next day I looked at it and it was suddenly protection 2... I was confused and pretty sure it was prot 4... So I went to enchant my boots and they had protection 4 to, I put them on and than I saw they changed to prot 2 to... Is there a plugin that prevents higher enchants on the server? Cause I couldnt see it in the plugin thread on minecraft.nl forum..