Hmm -- for me at least when a plant gets darker green I always wonder if it is not getting enough light. Since I grow in my house, getting enough light is always a struggle.

I also wondered what you repotted to -- is it coconut husk or something that might not have been washed or otherwise contain something the plant doesn't like?

When you say that it "has more leaves" -- do you mean it is bifoliate? (I don't know my catts well enough to tell from the name). It may be that this catt has slightly different culture requirements if that is the case. I'll defer to our floof experts on that . . .