I play on a survival server that has a spell called carpet which lets us slowly hover in the air much like how you can in single player creative and you can move up/down and move forward/back. While placing blocks while moving in the air it occasionally places the wrong block of a build in the wrong spot. I probably am moving too fast for the printer?

Does this only happen when you use the hover?

yes i believe so

Unfortunately any mod compatibility apart from anti-cheats is out of scope of this project since I don't have an easy way to debug mods and it would be too much work.