strange happening: Judgement spirit turned back into a Justice spirit

I searched but couldn't find a similar event. But the other day I noticed that one of my Judgement spirits had turned back into a Justice spirit. I don't remember exactly when it happened, but I am sure that the spirit was a judgement before and now is a justice. Weird. Not a huge deal, but a bit annoying. It is a spirit on Herja, so not so important, but I like having all my gear at full sets if I can. The spirit is actually level zero, but with it Herja gets a plus 5 dodge for the judgment 6 bonus. Not a lot but, still. I guess I'll have to make another one. oh well.