Baseline is not correct

I am new to P6 and I'm new to Planning Planet.

So far I have;

1. I am trying to compare 2 schedules; 'Pre-Impact' and 'Post-Impact'.  I have progressed the two schedules to different dates (including actual dates and any re-sequencing).
2. Both of the above schedules were created by copying an earlier schedule.
3. I've assigned the 'Pre-Impact' schedule as the Baseline (Project Baseline AND Primay Baseline) in the 'Post-Impact' Schedule.

Issue: The Baseline schedule in 'Post-Impact' does not match the dates in the 'Pre-Impact' schedule.

I've tried;

• Removing the 'Pre-Impact' as the Baseline then re-assigning it.
• Closing Primavera and restarting
• Refreshing the page
• Double checking the dates in 'Pre-Impact'

Question:  Does anyone have any suggestions as to how to get my Baseline to reflect the 'Pre-Impact' schedule?

Thanks in advance,

- Jeff