Same Base Amounts but Different Results in Approval Spreadsheet for AP Invoice

Hi,
Our base currency is in USD and we have 4 SAR invoices with different transaction amounts when computed using SPOT FX will have the same base amount of USD 20K.
2 of them are going to error when being approved (last 2) while the 2 are going through fine (first 2). My guess is because of the rounding off of the amounts.

Do you know how to correct this?

Thanks
Lyndon