If I'm the only one on the server that plays in the minigames. I don't know if it happens at all, but it happens at CTF, which has buggy arrows hitting the air and going low?
Hi! This sounds like a bug! Report your bugs here! This usually happens in Minecraft, you might want to restart your game. Have a wonderful day!
This is a visual glitch inside of certain versions of Minecraft, not sure if resource packs can affect this or not. Simply switching packs or restarting your game should fix the issue.