Something I Don't Get About Google Alerts

Google Alerts is supposed to be a great tool, and I have a really unusual name so it should be easy. The thing is, I get the same page, the same mention of my name, fairly regularly. One of the few other Auriette's in the world is a racehorse. She was racing '96-'98, from what I can tell. These same old articles keep showing up in my Google Alerts. I'm alerted about some of my tweets. Today I got an alert about a comment I made on another person's blog three weeks ago. I don't receive alerts about most of the blog prizes that I win, which are often posted on the giveaway blog. I signed up for Google Alerts to try to help me find out about wins, just in case the sponsor doesn't notify me directly or the e-mail gets lost. Unfortunately, it just doesn't seem to work that well.