I cannot really make sense of it: how do you know that the files split up into 2 albums?
Have you had the files on the iPad before but then they were still tagged as 2 albums?
Does iTunes show the changed data or how do you synchronize?
Have you tried to rename files (and not the tag data) so that the library on the iPad has to be updated?
Here is a thread that deals with updating information on iPods and iPads;