Are you using SharePoint server or SharePoint Online?
The icons suggest that you have synced a document library to the local drive/OneDrive for Business. The first icon with SharePoint symbol on it represents that it is the root folder for the document library.
The folder symbol suggests that it is the sublevel folder in the library.
When you first sync the library to local drive, it might display the root level folder icon as the second one, but it usually gets changed to the first one after a while.