When I try going on certain people's プロフィール it doesnt work, it takes me me to the ファンポップ ホーム page?

It means they either deleted there account または they were suspended.

When it does that it means that that person's account was either suspended または banned. Sorry.

It means they deleted their account または were banned.

It means their account was either deleted または suspended.

means someone got butthurt and reported someone ¬¬

jk'ing

they're account was either suspended または banned like people have already said