If you go into TEAM, and select game day, you’ll be able to check and uncheck whether you want to use an automated batting order or create it yourself. Do this and you should be good to go. Bet of luck.
Not sure but sounds like they up the max for the week of and drop it after. Seems like a good way for the game to make people max out(buy gold) in a hurry.
Sounds like your player is “capped” out. What you’re running into is either he’s hit his peak or you, as a team, need to level up to a new tier to upgrade him further.