no legs and animation

So ive been playing minecraft in a normal night in 2020-12-28 with my brother on splitscreen, and when we were playing on a survival world i noticed that i started to stop seeing, and so i thought, huh, thats wierd. maybe i can go to third person, but when i went into third person, i looked like the girl robot from wall-e because of the full iron armor set, but dont worry, my character went into normal again 2 minutes later.