The planned MTTD value shown on my graph for the final month of phase 3 is not the same as the value reported in the Project Profile report and the consistency report for my Phase 3 MTTD. It appears to be slightly higher in the reports.  Why?

The value displayed on graphs is the average MTTD rate for the final month of phase 3, but the MTTD value reported in the reports represents the planned MTTD at the end of phase 3. You should expect this value to be somewhat higher than the average value for the entire month, because the theoretical MTTD is always improving (getting larger) as time progresses.