On mine that's where the VST plugins were installed; to the Steinberg folder.
Look closely at the file sizes in both folders. The Steinberg files are all 69KB and the ones in the UAD folder are various sizes, ranging from 1MB or so to as much as 16 or 17MB. Also, the Steinberg folder has the mono versions as well. I think the Steinberg folder houses the VST "shell" plugins that call or reference the DLL files in the Univeral Audio proprietary folder.
I have my scan pointed to the Steinberg folder and everything is working well, including the mono plugins. (There were no separate mono versions in the UAD proprietary folder.)