"New device has joined your network"

I just bridged two network connections on each of three computers in my home office. Now I'm constantly getting a pop-up message from AVG telling me that a "New device has joined your network" and the message is always for the same devices - but this is only happening on one of the three computers. Super annoying.

Is there a way to fix this? Or disable new device pop-up on the one PC?

Hello Jeremy. 
Thank you for contacting AVG Community Support.
We have already replied to your other post please check that for further help.
We'd recommend you keep the entire conversation in one threat to speed up the resolution.
Thanks for your understanding in advance.

Hello Jeremy. 
Thank you for contacting AVG Community Support.
We have already replied to your other post please check that for further help.
We'd recommend you keep the entire conversation in one threat to speed up the resolution.
Thanks for your understanding in advance.