Can someone explain this to me?

I was playing master difficulty in side quest when I saw this. Just look at the Hercules's rating and other characters ratings in master difficulty.Also Hercules is 4* and others are 5*. I just don't get it. I just want to know if this is the case only with me

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Nevertheless, it should be working as intended, or else we would had received a IG mail or a note in the forums.