This looks like something which was reported and fixed during the Opus 12 public beta. From the 12.0.8 beta changes:
[ul][li]Fixed a problem where the Type column showed different things before and after a folder refresh (e.g. "File" vs "JPG File").[/li][/ul]
So i think that should now work in Opus 12.
You can try Opus 12 for free if you want to make sure before upgrading. Remember to use Settings > Backup & Restore in Opus 11 to create a config backup before installing Opus 12; that way you can always go back to Opus 11 and restore your config backup to get back to how things are now, if you decide it doesn't make sense to upgrade to 12.