Rejection: Cast and self

The name Darren Clayton currently has a cast credit (as "Prison Officer") and a self credit (as "Prisoner") for the film Wasteman. I have tried twice to remove the self credit. I have shown that the name is credited on screen as a prison officer, and since the film is a drama I don't think a self credit is relevant. I don't understand the rejection.

#260626-053906-520000

https://www.imdb.com/title/tt29028515/?ref_=ttfc_ov_bk

https://www.imdb.com/title/tt29028515/fullcredits/?ref_=tt_cst_sm#amzn1.imdb.concept.name_credit_group.7caf7d16-5db9-4f4f-8864-d4c6e711c686