Ok, this is a weird issue that i am having, but it started about 2 weeks ago. Basically what happens is i will be playing minecraft normally, whether i'm on skyblock or skywars, assassins or parkour, and my mouse will just randomly go mega-sensitive for no particular reason. It only tends to last for a few seconds, but if you've ever played OP skywars, you know that it only takes a matter of seconds to be sent flying to your demise. I don't think getting a new mouse is necessary, because this only happens on minecraft. I have tried changing my sensitivity to as low as 15, but it still goes from hedgehog slow to the speed of light. Imagine the 200% hyperspeed sensitivity then increase that by another 600%. It's like that. Another issue i have been having is a horrible graphical glitch that occurs whenever i increase my render-distance to 6 or higher. It reminds me of those graphical glitches in pokemon yellow where you hack outside of the safari zone to find yourself in a ton of glitchy trouble. Yeah... trippy. The last issue is that of anti-knockback. A few weeks ago, i was playing skywars with some friends when i was bridging across to an island. A player then came behind me and started hitting me, yet i took absolutely no knockback. I was even able to go behind the other player and put up a fight, however i think i lost the fight nonetheless. I think i have a screenshot of it somewhere, but i have 175,398 screenshots and i don't feel like going on another treasure hunt. This was before the optifine 1.8 update. I thought nothing of it, and put it down to lag, as i could barely move in a straight line in that game, although if that particular player was recording, i can guarantee you that i would be banned as even i couldn't believe it, and had to check which minecraft profile i was using. The only reason i mention this is because this same situation occurred again earlier today, but with a zombie. I was expanding the skyblock island when i found that half the island was mushroom and the other half was taiga.. i didn't even know this was possible, but it explains why i keep finding mobs on the left side of the island. Anyways, i got shot and took no knockback. I was playing in 1.8 on both occasions i believe. Does anybody else have these issues? The most common and frustrating issue would have to be the sensitivity increase, followed by the render distance glitching, followed by the anti-knockback glitch.