wireless network – Can not navigate while the wifi is connected

I can not use the Internet on my iPhone, even if the wifi is connected. I connected to the router settings using my computer to check Active Client Table. What I noticed is that every time I can not navigate on my iPhone, it is removed from the active customer table, but always indicates that Wifi is connected to my phone.

Although I have another Xiaomi phone that does not appear at all in the list, even if it works properly with the wifi.

I use the Digisol DG-HR3400 router. Is this the problem of my router?