Hello Evan,
Though I am no expert on any of these plants, I would assume that your plant is expressing its independence. In other words, I think your wonderful plant is expressing how different each leaf on each aroid really can be. Also there is the possibility that the hybrid version did not take well with this particular plant. Mojito is a hybrid, right? Also it may simply be missing the sun more than your other plants. I have had the same species of plants next to each other with one sick due to the same conditions the other thrived in. In fact that seems to be quite a common occurrence at least. Anyways, I would not give up on your plant looking the way it did before. Simply wait out the winter, & put the thing back where it wants to be this spring. Man am I glad I do not have a cold season here. Evan have you checked out my blog? I think you will like it.
