Its a glitch. It happens with alot (read, almost all) my Granzella clothes, and EVEN my furniture items do it too! Been this way for a long while now but youre the first other than myself Ive noticed bring it up Soulycon. It displays GZ items at the very bottom of your purchsed inventory list, and will incorrectly label them as your oldest items in there. Always bugged me but A) this issue is too hard to describe via twitter B) english isnt GZ's first language
Would be nice if we had a forum, where one could mention issues like this, and would be addressed/fixed.