What did you use to verify the metadata on the tracks? iTunes? Or another metadata editor?
Our app will group tracks into a single album when one of the following criteria is met:
1. Album name and artist is the same
2. Album name and album artist is the same
3. Album name is the same and compilation flag is set
If your tracks meets these criteria but isn't being grouped properly, please try a library reset.https://www.doubletwist.com/help/question/how-to-reset-the-library-database-in-doubletwist-player/
Also, please makes sure that the compilation flag isn't being set for only some files as our app will group according to compilation flag status (e.g. if some files in an album have the flag set while others do not, these will be grouped into two different albums).