Aaron Kamm and the One Drops have three albums but in two different places. Their most recent two albums are listed under the entire name "Aaron Kamm and the One Drops" while their first album is listed under "Aaron Kamm" and "The One Drops" separately.
You can report any content errors/issues such as these directly to the Spotify content team using the instructions outlined in this topic. Once you have submitted a query, the content team will investigate and then pass any needed details over to the record label to request a correction/change if needed (so it can take some time unfortunately!).