[Trexmaster]

The mercenary interface doesn't update until you open and close it, meaning you can constantly convert the same prisoner and get many duplicates of them as mercenaries, although exact duplicates of monsters will not appear in battle if you already have an alike version of them. I'm unsure if this is due to them being exactly the same, or if you're simply not allowed to have two of the same monster on your team.

[Neus]

This has been corrected.