Hey Dorian,
With only city and state, MapAList is essentially placing pins on top of each other in some cases. Looks like you have about 7 pins in Atlanta, GA. If you click on them and drag them to the left or right you'll see this.
In order to differentiate these pins, you'll need to provide more address info...
Alternatively, you could concatenate all the info about the 7 points into 1 cell in your spreadsheet that has the address "Atlanta, GA". In that case, a user clicking on the pin would see the details associated with all 7 addresses.
Hope this helps