I don't know if this is the right place for this but here goes. When I eat something I gain 2x the amount of food bars that is normal. For example eating an apple gives you 4 bars of food instead of 2. This behaviour does not occur in single player so it's not a Minecraft bug. I even put up a clean test server without any plugins using Spigot 1.6.1 build #999 and I can reproduce this bug.