When Roon identifies an album which has one or more multi-part compositions, the Roon metadata for the composition parts are displayed, not the track titles. This is as designed and is not a bug: your track titles are not being displayed, because Roon isn’t displaying track titles…
If you really want, you can (on an album by album basis, or using multi-album selection) choose additional options for preferring file metadata. Multi-Part Composition Grouping would be the one of relevance here. But you will lose all of Roon’s automated multi-part composition curation, and possibly lose compositions in the Roon data model as well.