The posted financial transactions do not show the correct transaction amount.

Why does the portlet(Posted Transactions Review) showing the incorrect transaction amount?

The transaction list page / portlet(Posted Transactions Review)

will show what rate is set in the rate matrix:
-Rate
-Actual Cost rate 

The rate matrix (Rate) will calculate the transaction amount.
The rate matrix (Actual Cost Rate) will calculate the transaction cost.

http://www.ca.com/us/support/ca-support-online/product-content/knowledgebase-articles/tec1502442.aspx
CA PPM : How should the rate matrix be configured? 

https://docops.ca.com/ca-ppm/15-1/en/add-ins-and-integrations/content-add-ins/pmo-accelerator/financial-management-portlets