Missing albums for artists

[JoshuaBradbury]

I am working on an application that works with past listening data and analyses it. Given that the only data about listening you can get is for the past 50 tracks, I resorted to downloading data through an information request and am then parsing the data. As part of this I need to acquire the track id's as they aren't contained. The most reliable way I hoped to achieve this was by searching all the tracks put out by an artist and all the albums they released/appeared on etc and then looking for the track name. However I have run into some issues, some of which I largely worked around like when artist names change and track names change. However my main issue is I have discovered some albums seem to be missing when making a request to the 

https://api.spotify.com/v1/artists/{id}/albums

endpoint. For example, Eiffel 65, with the artist ID "64rxQRJsLgZwHHyWKB8fiF" returns 49 items. However none of them are album id "34llTOMDUaSmdbMp9JrwYw". If you pull that album directly with the 

https://api.spotify.com/v1/albums/{id} 
endpoint it correctly has the above artist id as the artist. I am not sure why this is missing and there very well could be more examples I haven't stumbled upon. It very well might be an edge case but its certainly worth looking into!