1. Make sure the fields are actually IN the portal and not floating over it (if so, you would se just one row).
2. Make sure the fields in the portal are actually from the same TO as the portal, or on the same relationship line.
3. Make sure the relationship to the portal's TO is in fact correctly set up.
4. Create a whole new portal for the problem TO and see if that works OK.
Just some obvious issues I would try.