@it_sergio 

Hello, what I mean by main adapter is the powerline adapter which connects to the main router by ethernet cable. 

While you have 7 powerline adapters connected to the hub together, how many powerline adapters do you have in total?

Could you please draw a picture of the current network diagram and send it to us? 

Besides, cause you have 7 adapters connected to the hub directly, I suspect that there are 7 isolated powerline networks existed. You can power off the other 6 adapters which connect to the main router first and check whether the tpPLC utility can detect the remaining network; after that, you can repeat this procedure--make one powerline adapter connected to the main router at once and verify whether the tpPLC utility can detect it. 

For your information, the tpPLC utility can show up one powerline network at once; in other word, if there are multiple powerline networks existed, it will detect one of them randomly based on the data packet it received first. 

Good day.