What operating system are you using? What game are you using Zoonami on (MineTest Game, MineClone 2, etc)?
My only thought at the moment is to try running Zoonami on a new world, maybe on a different game as well, and see what happens. Perhaps a mod is interfering with it. Could also try and older version of Minetest if possible. I haven't been able to replicate the issue.
Thank you for testing that for me! I figured out what the issue is. There's a small bug in the villages mod. It's adding an extra value when a player interacts with a GUI. Most mods will ignore this, but mine has a strict filter to ensure only one value is processed each time. I will reach out to the developer of the villages mod and hopefully it will be fixed.