It’s possible that Round hasn’t updated to reflect your latest account balance. Where you see your linked account, you’ll also see when it was last updated.
Round grabs your balance at 12pm & 7pm UTC everyday which is enough for most people, but we appreciate for others you might need this to be a bit more regular.
You can always manually re-sync your account to get the most up-to-date balance and transaction date. Just hover over your account and tap ‘Reconnect’.