If you restart the season, have the CPU generate your lineup and edit it from there, you should be good to go. I’d stay away from any set one cards as a precaution. I had the same thing happen.
Does this fix editing the lineup for DD?
I’m not sure about that, but it works for mini seasons. I haven’t run into any other DD lineup issues.
Your solutions isn’t for our problems we can manage squad in regular menu not mini season