The Origami Forum

This happened because Lazma who is a newbie with less than 3 posts edited the already approved post they made in this topic. When someone with less than 3 posts edits a post it needs to be reapproved by a Moderator and thus vanishes from the sight of everyone else (unfortunately even the author themself, what I consider a bug that leads to many double posts). Might be that that person just edited the post while you were looking. Now that the post is reapproved you should be able to see it.

The reason for this Forum behaviour is, that for a while many Spammers tried writing something innocent first (often copying an existing post from another topic) and later when it got approved changed it to insert their spam links.