How to make all ubuntu 20.04 interfaces work?

Question

ubuntu

Good day! I bought a PC for a proxy server, new Huawei E3372H-320 modems. Everything works great, no complaints. What's on Windows, what's on Linux.
Plugged it in, 10 seconds and there is a 4G connection, started setting up 3proxy - only one interface works.
Initially, I checked everything on Windows, and installed Ubuntu Server 20.04 LTS - I could not solve this problem, I installed Ubuntu Desktop 20.04 LTS, but the problem remained.
Here is a screenshot of ifconfig - https://imgur.com/a/IoNl9MQ
enp0s25 - Network card, connected to the local network (192.168.0.100-200), tplink router (192.168.0.1).
enx - The first modem (192.168.1.1), after installing it, all traffic went through it, circled the megabytes that could be seen
eth0 - The second modem (192.168.2.1), after installing it, nothing happened.
All these interfaces seem to work, I can go to the device admin panel from a PC, but the main one is the first modem, whoer.net sees it!
Admin screen: https://imgur.com/qD5ZQRt
But when I start to find out my IP via wget -qO- eth0.me - gives out the IP of the first modem, when using --bind-address from each interface - only the first modem works (
Screen wget -qO- eth0.me --bind-address 192.168 : https://imgur.com/d9tmVRk
I came to the following conclusion: it works, but the system is missing some rule or route.
only the first modem works
3proxy settings: https://imgur.com/gq6FHRr
1000 - works, kievstar, the first modem as it should
2000 - does not work, Kyivstar, there should be a second modem, but no!
3000 is the same as 1000, the main one (

I have already read a lot of guides and configs, but I can’t understand what the problem is.
How to make all interfaces work correctly?
I will be grateful for every little thing that will lead to a solution to the problem!