When using JEI I noticed that the items don't overlap the menu buttons. But when using EMI the items overlap. I was told that this mod had to add exclusion zones. Did send a message on discord, but I think it will be better to add it here.
https://github.com/emilyploszaj/emi

This is clearly not JEI, but that aside - EMI compat for exclusion zones in the creative inventory screen is a part of owo-lib, and not Numismatic Overhaul. Please open an issue there instead.