player invitory bug

i dont know if it happens to everybody else but i know that its happening to me...ill explain...idk when it happened but i got on minecraft to play and such and i couldnt fill my inventory alll the way up so i didnt know why until i went to the crafting table and i was able to craft things that wasnt in my inventory...so my gess is that the things are invisable...and no i havent died yet in my world and im not willing to kill myself to let it go