You didn't had Pixie with Lightspeed and Kabuki.
Pixie has the pink type and the combo that you use, doesn't have the pink type. You only have purple, red, blue, white and yellow.
I don't think it was a bug, TL would never allow that we could have other types without having them in the breeding den, in the maximum the bug they would allowed was for us, not have had outcome the types that we should had, like the Leo should give when splited.