query's aggregate sum amount is off by $.01

Hello, I created a query but I find that the aggregate sum of the amount is off by $.01.

See screenshots:

If you add up the five amounts above, the sum is $5364.52

The field is an expression:

But if I update the aggregate to 'Sum' and run the query again, the sum is off by $.01

How do I make the query sum match the actual sum? Thanks for your help.