If you load multiple albums into Picard and let them recognize, they finally are available on the right side of Picard. You see a golden CD with (or without) a tiny red star icon on it.

If you select ONE of this albums and press the "Submit AcoustIDs"-Button, not only the information from this selected album will be submitted. It seems that the informations from ALL of the available albums on the right side will be submitted.

if i remember correctly, this was not the case in the previous Picard versions.