attestation helper entry shows incorrect next reminder and automatic decision

Hello Team,

I have set-up a custom attestation policy and in approval step I have mentioned next reminder as 16 hrs and next automatic decision as 40 hrs but once attestation is triggered ,in helper entry I could see next reminder as 5/10/2021 10:46:00 PM and next automatic decision as 5/11/2021 10:46:00 PM.I believe system is not calculating actual working hours.

What could be the possible reason?