Some light on the situation: the person behind the brand ranking chart threatened to take J-Hope out of the chart for the month of June after a fan asked them to review their data as the numbers didn’t seem to be logical.
As we can see on the provided conversation, the data

can be manipulated as the owner pleases, and the concrete sources of information remain to be unknown. As this chart does have its importance we would kindly ask of you to report under their latest tweet the following message, as it is, without being rude as it can be used +

against us. We have to be mindful here and not be too harsh as he can deform our words and twist the narrative. Here is the template to send:

아이돌 브평 중 방탄소년단 제이홉의 커뮤니티 지수 문의드립니다.
지난 1년간 제이홉의 평균 커뮤니티 지수는 770,545점이였으나, 5.25일자 지수는 약 10분의 1 수준인 85,961점으로 갑자기 90프로 이상 급감하였습니다. 혹시 수치계산의 오류는 없는지 확인해 주시면 감사하겠습니다. @kooceo https://twitter.com/kooceo/status/1264808380029235200