I'm not a moderator, so I could be wrong, but submissions may have got 'taken-down/'unpublished' because they could have been breaking some 'certain' guideline of the 'Content-Submission-Guidelines', which, in consequence, provoked this to happen.
Here you have the 'Content-Submission-Guidelines', at the following link:
Gekkotsuki
I'm not a moderator, so I could be wrong, but submissions may have got 'taken-down/'unpublished' because they could have been breaking some 'certain' guideline of the 'Content-Submission-Guidelines', which, in consequence, provoked this to happen.
Here you have the 'Content-Submission-Guidelines', at the following link:
(https://www.newgrounds.com/wiki/help-information/content-submission)
What was/were your submission/submissions about, in any case? Could you be a little more 'explicative'?