Do I have a faulty charger, battery or charging port?

Hello. I've recently bought a brand new xr. Like 3 months ago. The store I bought it from did not give me everything in a box. Instead, they gave me the phone, with a charger and earphones. Recently, I've noticed that when I plug my phone in overnight, it stopped charging during the night, but when I plug it in again, it charges properly, and even faster. The charger I have isn't apple certified. I realized a short while ago.

I also tried my same charger in my first gen SE and it works without hiccup. I don't believe the port is the problem because there isn't any sign of damage or dirt, and it does pop up that my phone is charging. I even tried wiggling the cord in it, and it isn't loose. Nor does it drop the connection. My battery health is at 100%. I have no problems with battery life. I tried another charger which isn't certified either and my phone said something like I needed to unlock the phone to choose an action or something.

Anyways, I'd really appreciate any feedback where this issue is concerned. Thank you in advance.