Hello. On my server that I'm currently making, I jumped on the spot and it just started glitching me in the air. After a few seconds, it kicks me and says "Kicked for Flying". I wasn't flying and I don't have any hack clients or anything, I do have OptiFine if that's an issue though (which I don't think it is). When I am in creative and I jump, everything is fine so it's just for survival. I really can't open my server in the future if this keeps on happening otherwise, players will leave the server because of this massive glitch that I can't find a solution to. I am currently using the latest version of Spigot that my host has to offer (1.8), I am using the latest version of every plugin and all of the configuration files are set up correctly. I tried doing /plugins and nothing comes up red, all green. All of my plugins are working perfectly. I checked my server console for errors and I even checked the crash reports; there were no errors whatsoever. I really need to find out what is happening. I've tried searching this issue in case anyone else had it but I can't seem to find it. Thanks for all help/advice, - PrinceMC EDIT: Now it is happening whenever I WALK in survival mode. EDIT 2: Okay, this is insane! I turned allow-flight to enabled and it's still glitching! Now it's every time I look around, it puts me 10 blocks in the air and glitches me down and up a couple of blocks every 0.5 second. This is really pissing me off. I tried restarting my server (/restart) and it still does the same thing. Keep in mind that this was happening BEFORE I installed ANY plugins.