My Ender 3 that I upgraded to a v2 is behaving oddly and won’t properly probe

You have done something wrong it's not your mobo. You ether have the end stop no plugged in the right spot or it's not programmed to the pin it's plugged into in the firmware. There are also probes that look the same but the wiring 5v is switched and you can fry your mobo if you don't check. Crealty are shit I have 2 of them they always change stuff and do things in strange ways for a bit then go another way about doing something. I think it's more them making the most printers out of what ever shit parts they were able to get cheap on mass and then putting untested buggy firmware. They have no support or quality what so ever. Put simply. I need more info to help you. What board are you using now or want to use? On the probe plug sticker where does it say 5v is. The third wire out of the loom? What firmware are you using did you get the correct one for your board version. The the firmware for the correct probe. Welcome to crapality and cheap printers. It's all down hill from here fam so buckle up.