Hunger bar bugged

My hunger bar is stuck at 8/10 and it doesn't let me eat (note: the "eat" button doesn't appear as if i were full) i can eat if it drops below that but it won't go further than 8/10
ps. this only happens in 1 world, i tried restarting the console, changing from peaceful to easy and it regenerated but when it depleted it stayed at 8/10 max again

What i expected to happen was..-
eat a couple of carrots to regenerate some health

What actually happened was...-
i can't eat my carrots until it drops to 7.5 points or below and it only increases up to 8/10 points
and doesn't regenerate any health