Extract Rule Fast Formula is excluding most of the employee data

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Hi Experts,

We are creating an Payroll Interface with output file type as xml we had to create a lot of custom Extract Rule fast foruma to satisfy the clients requirements.

One of the specific FF is creating an issue, when using the FF in Extract, output for most of the employees are not getting generated only selected few is getting generated, and when we remove the FF it is working fine.

Is there some kind of Extract Rule FF functionality I am missing? like in certain conditions of the FF will exclude the employee data from the output?