What exactly does a citation alert from Google scholar mean?
There are several types of Scholar Alert, which basically boil down to:


We found one of your articles
We found some articles that you should read
We found somebody citing your articles


When you get one that says "New citations to my articles", that's the one you're looking for.  In that email, the articles listed in it are the ones that cite you, not which articles of yours ones being cited (you have to figure that bit out for yourself).