SSL Not working for my network but fine for others.

So, I've run into a weird error. Whenever i go to my domain on my computer. Or as a matter of fact, Any device on my network. It says unsecure but if anyone else goes to it they get the full origin Certificate and ssl. Https used.
But it's only for my network, When i change my phone to data rather than wifi. It works fine but laptop, computer, phone on network unsecure? Anyuone got any ideas why