Yes, Penta's mask conflict is a glitch. The proper mask that belongs to him is the Aku Aku mask.
Oh, and for the people who don't know who Penta is and how to get him, this is the proper code:
L1+R1(Hold)
Down, Right, Triangle, Down, Left, Triangle, Up
Use at main menu.
If you see me posting, it's because I've been asked to. Which I guess would mean I'm taking requests.