Thanks for the update, that would be most likely it.
I have had issues in the past when ripping directly into the Roon watched folders … these days I use a staging folder and then after checking all is well with names and tags etc. move the files over in one swift action.
The alternative would be to temporarily disable the watched folder in Roon whilst ripping.
I think you will find that if you had edited the album by changing album covers before you imported it Roon will occasionally split the albums. If you look at the data before you import you ‘might’ see that the individual tracks might have had more than one album cover associated with the tracks.