end problems

Me and my friend were playing minecraft what happend was when we went to the end to fight the enderdragon we had major bug issues. First endermen were attacking me for no reason, i was not looking at them nor attacking them. Second what happend was the enderdragon had no health bar on the top, we couldnt see his dragond breath or magic when he used it, when he finally killed the dragon he dropped no experince when he died