Why are some of my successful downloads marked as "hidden"?

[BeetleJuice4]

I've seen a number of variations about this problem but I guess I have the "best" problem to have. I have this setup with Radarr and Sonarr and all of the files download and save without any problems; however, some are listed as hidden and some are not. It seems to be mostly fie upgrades of existing shows but not all of the time. So when looking at the history I always consult the hidden successful tab first to accurately show me what has happened.