iCloud Contacts - email addresses not displayed

If you insert an email addess into a Contact at iCloud.com, the address is correctly displayed after you exit "Edit". However, on contacts that have been imported from the Outlook email client via "iCloud for Windows" on a Windows PC, the email addresses are not displayed. Nor are they displayed in "Edit" mode. However, the same email addesses are displayed on the iPhone and iPad, so the email address data does exist at iCloud.com, and the iPhone/iPad/Windows PC do sync the email addresses between them correctly. It's just that the email addresses are not displayed at iCloud.com. I suspect that this is an iCloud.com bug, and not fixable from signed in devices.