A person can't resteem a post that isn't already there!
Maybe it's got something to do with your browser. Try using a different browser (Chrome, Firefox, etc.)
If your post had been flagged down below $0, it would still appear but be light grey colored and people could still read it if they want to.

Occasionally flags are abused, but they also have an important purpose of stopping spammers, plagiarizers, harassers, abusers, etc.
Normally people think twice before they start flagging, because it can come back to bite them too.

I went to bat for a small newbie a bit ago, who was posting something that can be considered controversial. The guy who flagged him had only a little more steem power than he did, but enough to make his post invisible since the new guy didn't have many followers. So I confronted the flagger and he said that it was his right to flag, so then I told that if he felt that way, it was also within my right to flag his posts back and make them disappear. Needless to say, he changed his behaviour and removed his flag.

So yes, it's a delicate balance her on Steemit.
The platform would quickly become a bad place though if we couldn't flag all the plagiarism, etc.