You don't need multiple EFI system partitions! That's why Mint and OpenSUSE don't show up in each other's boot menu (or at least that's the first step, depending on your bootloader). The intention with the ESP is you put all EFI executables for dual-booting (and triple- and beyond) in there.
None are game-breaking! You can just note these down for next time you have the itch to tinker.