The Linked column may display ☆ to show that the associated track has an explicit Album Rating set in iTunes or Music.
The Apple applications either synthesizes album ratings or track ratings. How it works depends on the Album Rating value. When the album rating is not set or set to zero stars, the application will synthesize the album rating based on the average of the album's tracks's ratings. When a non zero album rating is set, iTunes and Music will display the same rating on tracks where there is no explicit rating. Visually the only way to know how it is currently working is by the colour of the stars. Grey stars represent synthesized values.
If you want to display accurate track ratings you have to reset the Album Rating to no stars. Note that starting in Yate v4.1, Apple ratings are treated as zero if they are synthesized.
Via the Export to Apple App action function, you can force a reset of the Apple application's Album Rating state. You can also do the same via the Settings - General - Clear Album Rating ☆ whenever exporting linked data option and from within the Compare Apple App Values panel.