Im having a very difficult time understanding how to connect 15 sp20s to my lan network. They are all powered correctly. This is the setup. I have a modem that connects to the coaxial cable and to the source Ethernet. The source Ethernet connects to a router with 4 lan options and wifi. One of the ports is connected to a 16 port switch, which then connects to each miner. My problem is when i pull up myminer.io only 4 show up?

I am extremely confused on how to fix this. A small reward will be offered to the person (to whom I deem fit) who helps me solve this problem asap.
Thanks everyone in advanced, best community in the world!!