Zoho [Email] Campaign - "Total Opens" all showing 0 - not updating correctly??

Zoho [Email] Campaign - "Total Opens" all showing 0 - not updating correctly??

There must be a glitch in my Zoho Campaigns, b/c on every recipient it shows 0 for Total Opens.  It registers that they opened the Email (via the email campaign) but on every recipient's 'total opens' it has a 0.