iCloud Website view not showing folder size

Hello, the problem is as stated. I log into iCloud.com on any device, I go to the three dots on any folder, I hit "Details" and it loads up a details popup but the folder size is left blank.

The files do show their sizes, just not their folders. I'm trying to clear out space on multiple devices at once and would like to be able to manage that process from iCloud.com but am unable to see the biggest space takers because of this, I must be missing something. Any help is appreciated!