<xbox series X>BUG？Game difficulty automatically changes

[asfgewg]

I created a survivor difficulty save, but after playing a few levels I found that the prompt when saving changed to custom difficulty.
I thought it was created incorrectly,So I opened a new save data,But I found that after rescuing the pilot, manually overriding it again changed to custom difficulty again.
Will this affect achievement?

 

[asfgewg]

The problem happened again, this time I used another language.

 

[Cassilda]

This one just happened to me as well on pc.