Amazon Reporting confusion

So I am quite new to Amazon reselling and trying to add my Amazon sales into my existing reporting to work out monthly revenue etc.

I have been using the Transaction Tab on the Payment Reporting section of the website and tallying the Total Product charges for the month to work out my revenue.

However when i compare this to the Business Reports -> Sales Dashboard this does not align. The Payment reporting is showing a higher figure for each month and the Year to date than the Sales Dashboard. And when I look at individual days nothing aligns.

Can anybody assist with an explanation on why these would be different? And what is the best report to use to define monthly Amazon revenue and fees paid?

Many Thanks in advance!