Spend lift and Participation Rate on landing page is being calculated after the receipt details are being loaded into the receipt_stats table. For previous day stats, if the landing page refresh happens before the pos receipt counts for yesterday were loaded into receipt_stats table, we won't be able to see the Spend lift and Participation rate.
The landing page (for business timezone) is refreshed 6 times a day, at 0, 4, 8, 12, 16, 20 hours in San Francisco time. So in the next refresh (once the pos receipt data is capture) we would be able to see the stats for both Spend lift and Participation rate.
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