Non-system folders detected as system

Once upon a time I set Dopus to show the text for system folders in red. Now a lot of my non-system folders are showing with red text. I can't figure out why. Short of turning off my preference, can anybody tell me how to make this setting work right?

What are the attributes on those folders? (Use the Attr or Genera/Attributes column.)

Does toggling the Preferences change things? There are other reasons that items could be red (e.g. labels applied to them by path or filter).

Thank you! You got me on the right track. The folders in question had the "S" attribute. I'm able to unmark them using the Properties drop down menu. Still don't know how they got classified as "system" though!