Significant difference in figures between payments dashboard transfered amount to Amazon's payment email

Hi All

It's my payout day today (If you can call it that) I am noting that on the payments dashboard is one figure that they say they have initiated a transfer for & an entirely different amount in the Payment email notification.

In fact the amount they say they have initiated on the payments dashboard is £153.10 less than the amount they say has been initiated in the email?

Anyone know why? no chargebacks or refunds etc