Some tracks from audio books being split into separate album
Some audio books are being randomly split in two. For example, Harry Potter book 1, 7 tracks have been put into one album and the remaining (over 400) tracks in another. I've been unable to find any difference in the tags on the seven tracks, and Dopamine v2 didn't do this.

Would you mind attaching you Dopamine database? It's Dopamine.db in folder %appdata%\Dopamine in windows or .config\Dopamine on Mac and Linux. Dopamine 2 and 3 use the same logic for grouping tracks (combination of Track title and album artist). So I'm really curious to see what is going on. The Dopamine F.A.Q. might also help (see Why are some of my songs not grouped in one album?): https://digimezzo.github.io/site/dopamine-faq
DopamineDBs.zip I have included the databases for version 2 and 3 which, interestingly, are the same size. The issue isn't exclusive to the Harry Potter books but are particularly noticeable with them as the company that created the MP4 CDs decided to split it into tracks of around 1 minute, so there are literally hundreds of tracks. I can see that it has also happened with one of the Anthony Horowitz books and an episode of Poirot, for instance.