Source: WowAce

Both Rarity and Pettracker add "Drop" and "Zone" information to caged pets tooltip. Having both enabled will cause tooltip to display same information twice like this:

Pretty sure the text is from Blizzard's pet journal. Multiple addons adding stuff to the GameTooltip is always problematic, though it depends on what they're adding (and how). If there isn't another report of this problem, I doubt it's something we need to be concerned about if it isn't currently reproducible.

I love when problems just solve themselves without me having to do anything. Thanks!

I couldn't reproduce this.

I did find this from the same user who reported: Jaliborc/PetTracker#210

Is it even Rarity which adds that?