Weird PS4 DualShock controller issue

So I am fixing a couple of PS4 DualShock controllers for my friend, one of them has stick drift, so I’ll just replace the part, but the other one automatically goes to Player 2. I don’t know if I need to clean it, if it’s a firmware problem, all the buttons work, but it just goes straight to Player 2. Is there any way to fix it, or is it just a Player 2 controller forever? Thanks in advance!