Why is a delayed activity not showing on the delay table?

The delay table only shows what delays happen on the critical path since they are the activities  that impact the end date of the schedule. If the delay is not on the critical path, the delay table will not show it. Go back and validate that critical path activities are accurate.

On SmartPM, you also have the ability to model another scenario and understand how that impacts the critical path. For more information on Advanced models and Conditions in SmartPM, visit: https://help.smartpm.com/modeling-scenarios