Known (named device) device details blank

So I have a known device on my WiFi that is a family member. Her device details model, Operating system and device type are blank. Instead of the circular icon with the phone and the green dot showing connected, The icon is blank with three black dots in the center and of course the green dot showing connected on the outside of the icon. There’s also another one authorized that is the same way. I’m just wondering why this is and is this something changed on the phone or a program loaded in order to bypass something on the router? Thanks in advance for your help.