Your last image doesn’t show anything for port 8080
I use a similar setup to you, with a Huawei router provided by my ISP and a Netgear router which handles my internal traffic. I use this to get around my ISP locking down some of the features in their router, such as DNS settings.
I do things differently though. ALL data on all ports is forwarded from the ISP router to my own, and my port-forwarding is done in my own router.
Pete.