Account balances are not matching YNAB
The most common cause of an account balance mismatch is that you are using multiple budgets (or an archived budget) in YNAB and have mapped the wrong one. Go through the mapping process again and verify you have the correct budget and account selected.
It can also be a syncing issue. On the Debt Details page for the account, click the YNAB Sync button to force a sync.
YNAB balance wrong, not matching