On the landing page (dashboard), the participation rate is calculated using the "created at date".
For example, if a guest's point of sale receipt is from 9/2 but they scan it on 9/4, that receipt will be credited to the metrics for 9/4 as that is when the checkin was created.
The lift report shows data in UTC at the time of the creation of the receipt in the POS. For this reason, there can be a discrepancy between the two.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)