Below explains why the CR might look different in your export compared to your dash.
Podsights calculates conversion rate by taking Visits divided by Reach. If the analyst is adding reach numbers across all line items in an export, then this would cause the discrepancy. Another reason could be that you are looking at the unmodeled data while the data in the dash is defaulted to modeled data.
Note: reach numbers are NOT additive as there will be overlap between line-items. The best way to get reach is by using the campaign dashboard, or by using the ‘Insights’ section of Podsights.