I have that! when it got transplanted all it's kidney leaves went away, it made some like those of U. bisquamata and then went back to making kidney leaves. Interesting.
The tricolor was originally from natch greyes.
Wait, the tricolor's kidney leaves went away and it produced bisquamata type leaves? That's odd, I haven't had that happen, yet. You might have some cross contamination in there (I'm guessing with bisquamata, though I'm not sure how) if you're getting something other than kidney shaped leaves. Keep a watch on it and let me know if that's the case so I can reassess my potting situation to better segregate the plants.