Similar thing with my credit report. Showed that not on electoral roll and on several searches the time at address field showed 00 years and 00 months..
As I am on the roll and have written confirmation of this - approval of postal vote - I asked Experian why and was told that my address details had to be EXACT match with electoral roll entry.
This caused more problems cos the data entry field for address was too short...I eventually got this amended but wonder if refused credit due to this?
I also have an alias - it is my maiden name!!
When sorted out my bank charges I would like to get further into this cos I find it unbelievable that the system they use is so inefficient - eg the first part of my postcode is attached to the city field as well. EG London SE8, SE8 9XX.
According to the experian agent I spoke to this is another quirk in their system..