Old Metadata still showing up in roon

You did (report it), it is probably just the wrong place. Here is for reporting false metadata provided by third-parties (allmusic/TiVo, MusicBrainZ, streaming partners). You, as it looks like currently, seem to have an issue with Roon Server itself – should probably be in Support instead.
I hope a staff member will soon move your thread (or provide insight about your issue here).