De novo confidence queries

Hi all, I have used hl.de_novo to call de novo mutations, and I am trying to understand the “CONFIDENCE” field. I understand that the threshold has been defined on the website for the original caller (GitHub - ksamocha/de_novo_scripts: Script used to identify de novo variants from sequencing data.).

However, checking my confidence field, I made this observation:
For “HIGH” confidence, isn’t p_dn>0.99 a requirement? Can anyone explain this discrepancy, please? Really appreciate any input!

There’s a case in the calling algorithm that results in HIGH confidence calls for high-depth proband calls with p_de_novo > 0.5: