I am playing Minecraft and everything is normal, but all of a sudden  I keep getting attacked by a spider that I cant see! I could lure it to different places, I eventually trapped it and that was that but there were other weird things. I could not hit it or kill it, I even used lava. didn't work, I didn't think too much of it until I came back to my game after getting off for a bit and when I came back the spider was still there! When I trapped it I thought I would go about my game but now I have creepers that are invisible and blowing me up! but it has only happened a few times, what is also different was that the creepers were always trying to blow me up were doing it in the same spot, on the edge of my house. I don't know and it isn't costing me much because I haven't died yet however its starting to get really annoying when I have to keep re building a certain part of my base over and over... TY!