You are adding the player to the roster while you have temporary control of the team. When you leave that the computer manager is in control again and doesn't agree with your decision.
The way to fix this is to get rid of the reason the computer manager thinks you're wrong. Note this doesn't mean that you're wrong, only that the computer manager thinks you are.
I had a situation where a team was carrying only one catcher. I called up another catcher and the computer manager demoted him. The issue was the team had 13 or 14 pitchers, I think it was, none with minor league options. It would not cut any of them loose.
I shopped several of them and got players with minor league options in trade. Then I brought up the second catcher and the computer manager let him stay.
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