Group list in Contact Detail is showing contact ids instead of name

[scott@accelcrm.com]

Upgrading from 6.2.6 to 8.0 with updates to Web Core/Model 3.

In the Group List at the Contact level I am seeing contactids instead of the contact names.  This is only happening at the Contact level.

I verified that the first column was a valid field (Fullname calculated field) and also tried to add FIRSTNAME as the first column with no change.

Any ideas?  They have dozens of existing groups so I'm hoping I won't have to do anything drastic like recreating them all.

[scott@accelcrm.com]

Ok, looks like their existing groups generally use contact.fullname.  If I change a group to use contact.namelf the group list is populated correctly.  Looking to see what might be different between these two calculated fields.