The 14 day pending period, where #pi is frozen and prevented from use on the Mainnet blockchain, is an essential part of the migration process in part because it allows time to ensure the security of the Pioneer’s Pi and accuracy of the migration before it becomes permanently irreversible on the Mainnet blockchain.
Some Pioneers who have their Pi returned may see their migrated Pi balance be returned to their “Unverified Balance” rather than “Transferable Balance.” This was because the displayed amount in the Transferable Balance is a pessimistic estimate for the UI, whereas the actual migrated amount during migration will go through sophisticated calculations that usually take a long time to compute. This does not reduce the amount of Pi that Pioneers will receive in their next migration. After successfully migrating, Pioneers will receive the same amount of Pi as their original migration amount (or even slightly more due to increased mining sessions included).
The 2FA for wallet confirmation requirement and the returns of Pi for some accounts during the 14-day period can cause the circulating supply to drop. But as more Pi is re-queued and migrated again, the circulating supply will change accordingly.
If you have completed all Mainnet Checklist steps and are waiting for the migration process to complete, make sure to add a trusted email and complete 2FA as soon as you receive prompts to do so.