Melon Glitch?

[TheScout96]

So I play on a Hexxit server and I've noticed that when eating a melon slice, instead of filling 1 hunger bar like it should it will completely fill my hunger bar, it's not just me either, however it may look like your food bar is full but in reality is only filled by 1, so if there is a way to fix this or if this is a bug I've found could I have some help with this? It gets a bit annoying after a while.