Issue with 5G SSID saying password incorrect on iPhone 15 pro/plus after typing it correct

I turned my smartsteering off for my modem since it was causing issues with the wifi turning on and off on both my pc laptop and my 15 pro and 15 plus iPhones. Splitting the bands helped out with the wifi a lot but my 15 pro and 15 plus were connecting to the 5G band for a few days after splitting the bands but since yesterday are not connecting to the 5G and keeps saying incorrect password even though I keep inserting the correct password. Also my ASUS Pc laptop was not connecting to the 5G either saying connected but no internet. Both devices  work fine when connected to 2.4 though as well as my laptop is showing connected and secured  for the 2.4G. Currently the 2.4G is only connected to my downstairs tv (my modem is placed upstairs). The 5G is connected to my upstairs tv and is working fine on it also my father has the latest 17 pro max and is on 5G and has never had any problems that i have had on my phone. Also the 5G is connected to my Apple laptop and I also have and old iPhone 5C that also has no problems with connecting to 5G. So this issue is only happening with the two iphone 15 series models and my PC laptop. 24 hours later from last night to tonight it still says incorrect password on my 15 series phones when trying to connect to the 5G. Is there a way to fix? the 2.4 one is the network ive been connecting these 3 devices to for the time being.