CL_BCS: duplicate email generated

Hi!

I'm using CL_BCS to send email, if I have 3 recipient each recipient receives 3 copies of the same email, if I have 1 recipient gets 2 email.  This is happening in the production system.  Is there a BASIS configuration that I need to check for this or missed setting for CL_BCS in my code?

SOST in production

But during testing both in DEV and QA box the functionality is working as expected and each recipient receives only 1 copy of the email.

SOST in dev

CODE for adding recipient and sending, cls_send_request ref type of cl_bcs