Irregular permalinks

Hi,

I’ve just enabled permalinks on http://www.royaltech.net, the format is as follows:

/%year%/%monthnum%/%day%/%postname%/

However, I’m getting irregular link formatting.

ie.
http://royaltech.net/blog/2006/01/09/maya-de-dhaba/
http://royaltech.net/blog/2006/01/09/restaurant-reviews-bambini-trust-cafe/

both are restaurant reviews, but nowhere in the string above have I included the category.

Perplexed!

Thanks