Late dates showing for some completed activities but not others?

if an activity is completed there is no longer a need for a late or early date. The difference between the early and late dates is the float. If an activity is complete there is no float. The only way that there would be a late date is if there is not an ACTUAL start  or ACTUAL finish.

John – “My assumption would be there is something un-completed in the chain but that is not checking out.”

• Agree – maybe a driving link with some remaining lag.

Zoltan – “If an activity is complete there is no float. The only way that there would be a late date is if there is not an ACTUAL start or ACTUAL finish.”

• Agree, in any case it is on active links/relationships that there might be some “float” or “slack”. 

https://www.linkedin.com/pulse/relationship-float-viewing-primavera-p6-santosh-bhat

Most software does not show early/late dates for completed activities.  I cannot see a reason to show meaningless values.