I am not an administrator of this forum, and your post is hidden from me as well, but I saw something similar with one of my first posts. I managed to trip over the mdoc (or whatever) formatting with some pasted content causing the post to be quite ugly, with some text intended to be formatted as fixed-width showing up huge and bold, and other bits of the same paste tiny. I wasn’t familiar with using the preview pane to the right of the composition text box. Someone reported the post and it was hidden for admin review, during which time I figured out my error and reposted with correct formatting.
Perhaps there were a lot of external links? Just a wild-ass guess at what might trip the forum’s spam filter.