why some question in community just disappear

Hi @not_now -

Check your email (the act associated with your apple id). If they were edited or manually removed by the moderation team, you should have received messages documenting these actions. if no messages were received, you might wanna give it an hour or so and check again – it’s possible the database is experiencing lag issues.

I just checked your "Subscriptions" at about 0915 Pacific Time (25 June):

not_now_’s Subscriptions - Apple Community

That shows only this thread, so the others were not simply moved to a more appropriate forums section. What was the subject of your question? In what section of the forums did you post?

Section B.1 of the Terms of Use we all agreed to follow when we signed up here covers Submissions, including some of the things that can get a post zapped:

Apple Support Community Terms of Use

Other causes for complete removal can be posting rants, selfies, or other non-technical material.

Usually, any revealing personal info like physical or email addresses, phone numbers, device serial number and IMEI numbers are edited out but do not result in the removal of a entire thread.