Custom fast formula in the Anniversary Event Rule is not working correctly

Summary:

The custom fast formula on Anniversary Event Rule is affecting post - Global Transfer absence balance. Although there are no syntax or logic errors in the fast formula, only using the formula causes a gap in the balance. When we are not using formula, there is no gap occuring in the balance. However we have to use the formula.

How can we solve this problem?

Content (required):

Test record :

Original Hire Date :    07/12/2011

Global Transfer Date :                  06/25/2022 --->  180 days balance is carried over at that date

The correct balance can be seen up to 07/11/2022.

Between 07/12/2022 - 07/11/2023 no balance can be seen. The balance previewing screen goes blank for 1 year.