This looks wrong, or incomplete. 

"employee.attendance_ids" contains ALL attendance data, and I'm sure this is NOT what you want.

You must always filter the data for the current month, or in alternative with an interval of your choice.
Eg: You pay every w week 
or 
When you pay on every 21st of the month, and the remaining days are paid in the next month (on the 21st). 

Possible fix:
Add a filter to the attendance_ids, so you only get the ones in the required interval and not ALL of them.

You can use Check IN to validate the time intervals

can you please provide the code for those you pay on monthly and weekly base ? it's good to share it