Quick question regarding desktop hardrive

It can take longer for that information to update. I've noticed that while having that feature turned on. If it's really bugging you, try restarting and see if it updates. A log-out and log-in might even do the same thing as the restart.

 

I think even re-launching Finder from the Force Quit function in the Apple Menu will help. Of course, it's not cool to continually force quit a process.