Nolo,
I ran in to the same thing and was curious myself...I don't have an answer yet.
What Nolo means is that before visiting pridelands and halloween town, we went straight to hollow bastion for the fight with Demyx and the 1000 battle heartless fight. Now, what we're running into, is that the two worlds we missed are blocked by clouds and we can't get in to them.
So, we are going through our second/third missions on the other worlds, but we never completed the first missions on the worlds we missed.
When will these be unlocked??