This is something with your Anti-Aliasing. I had the same problem a few days ago. For me it had something to do with a program called NVIDIA. I changed a few of the settings and it worked fine afterwards.
I was banned on a Tekkit server for border greifing. First of all, I didn't greif. I raided some chests that weren't protected. Second of all, there was no rule (that I saw, and I read the rules) about border greifing. They put it on after the incident happened. There's protectors for a reason, so why not use them? An admin came on after a player requested for one. I told him that there was no rule about border griefing in the visible rules. I also told him that there's protectors to protect what you want protected, not the things outside your protection. He banned for "Disrespecting staff".
Skype or any ways to contact (Preferred Skype): KaptainCPU
Redstone Experience: Computers, Calculators, GPUs, Redstone doors (3x3-5x5) and much more
Proof of your Work(Images, Maps, etc..):
Any other information you would like to add: Message me if I get picked. If it means anything, I also know how to program. Redstone computer components are my favorite to do. (And if it helps, I know binary)