Qmi ping from wan problem

I have a zbt we826 modem that uses a 4g quectel module
When I use qmi to connect to the internet and activate two of these modems with a SIM card, if the isp ip I get from wwan0 is on a netmask, they will not be pinged.
For example, if two modems are wwan0 with ip
They don't ping each other
But if I change qmi to utms, this problem will be solved
How do I fix this problem on qmi?