SIM (LTE) is working but on the wrong interface

I have a ZBT-WG1602 LTE (SIM) router. It has two Active-Active LTE ports. I am using QMI protocol.
When I insert only one SIM in port first the SIM has registered on WWAN1 (/dev/cdc-wdm1) but it should register on WWAN0 (/dev/cdc-wdm0) but when I insert both SIMs. SIM1 has registered on WWAN0 (/dev/cdc-wdm0) and SIM2 has registered on WWAN1 (/dev/cdc-wdm1) which is correct.
I want that when I insert only one SIM on port first it should register on WWAN0 (/dev/cdc-wdm0)
Thanks.