Weird wifi settings please help!

I live with my uncle to take care of his children while he is hospitalized. I know the password of its wifi named let's say for the short TP-LINK.
When I connected to wifi, he said no internet. Then I turned off the wifi and turned it on and connected it.
Then later, when I tried to reconnect, I just couldn't do it. So I went to the wifi browser page and he said there that wan port is unplugged.
Then, after a while, I tried again from different places and connected it. So I went back to the wifi page to see what was different. Even though I logged into the
wifi name Tp-Link The wireless section showed a different ssid "random wifi" and a different password. So I wrote down that password.
I noticed in my phone's wifi list available 4 wifis.
The original tp
link,
random WiFi, Random
2.4 wifi, and Random 5 wifi.
The password for the last 3 were the same.
It sometimes connects to the Internet and sometimes it does not.
If I approach the strong wifi connection, I can log in and use it anywhere when connected to the internet. Otherwise, in another place, it still says no Internet, even if the signal is good.
I don't know why it has 4 routers or only 1 with so many different settings.
Also when there is internet, the wifi page address is 192.168.0.1 and when there is no internet the gateway is 192.168.1.1. It's so weird please help!!!