Hello, bro!
Dude, I don't know how, but EA finds a way to make the EAFC franchise worse every single year. I had the same problem, and the solution that worked for me was:
For some reason, "Game Type Settings" is a global setting for Career Mode and the whole game, but "AI Sliders" is a config that doesn't save properly inside Career Mode. It's unbelievable, I know. I changed my "CPU Sliders" in the main menu, and that worked for me.
By the way, before doing this, I deleted all files in my settings folder (like C:\Users\[your user]\AppData\Local\EA SPORTS FC 26\settings).
If changing it in the main menu alone doesn't help, try deleting all game save settings too. I hope this works for you! :)
