Invoice approval status report

 dear 

i am using r12, tested payable invoice approval via approval management engine found following issues during testing;

1. When I change Invoice amount through "view additional invoice details" in AP Invoice approval notification  it shows the old invoice amount approved by user in "Invoice approval status report" and the revised amount in parables invoice window.

2. Invoice approval status report shows incorrect invoice  i.e if an invoice of Rs. 100,000/- is approved by 3 users it will show the total number of invoices approved = 300,000/- instead of Rs.100,000/-.  

could you please guide me what is the problem and how to resolve it.