iTunes incorrently splitting the songs in an album. Metadata problem?
I've only ever seen this happen when the metadata absolutely differs in some way between tracks. There are two ideas that come to mind:


Highlight each individual character and make sure 3 dots ( ... ) haven't been transformed into a single character elipses ( … ). Highlight each of the dots above and you should understand the difference.
Check the 'Sorting' section too and make sure all of that data is identical, notably in the 'Grouping' fields.