Hello,
User balances are derived from summing all of a user’s transactions.
The transactions are attached to WordPress user ids. If you have migrated your site, the ids of the users are probably different now. Clear the new wp_wallets_txs table, then use the export/import feature to migrate the transaction data. The export feature is found in Wallets -> Adapters -> Export, under each adapter. This will create csv files where the users are uniquely identified by their email. The import feature is found in Wallets -> Transactions at the bottom of the page.
with regards