Im not sure if this was intended. If it is just close this. But it looks like All the new ZG stuff that came with 10.0.7 is showing up for Classic ZG and Cataclysm catagorys under dungeons and Raid.

This was fixed and shows up in the correct place now as D&R Cataclysm > Zul'Gurub, do a hard refresh and relog if you continue to see it and it should fix itself

New ZG content was moved to not be within an old zone that was removed.