No weapon level up, or attachments

I have an Xbox series X. I know all of these forums keep stating that they're having problems of not leveling up weapons or getting their attachments. And then everything says problem solved! This is wrong! I am still having this stupid problem! It's bad enough that this stupid game by EA sports is crashing my xbox, now it won't give me my level up of my weapons or my attachments. I have followed every little stupid suggestion online. It is still not doing it!!!