Using a decimal precision of greater than 2 places in any of the 'Default Base Rate' fields in the Chargeback pricing values causes the value to change to zero.
Aria Operations 8.16.1
This is a known UI bug that is resolved in Aria Operations 8.18.x.
Upgrade the Aria Operations instance to 8.18.x.
In Aria Operations 8.18.x, the decimal precision has been increased to 16, an increase from the previous 12.