If
you can move other posts to new topics without problem there is an issue with that post only. Can you find or create another post with a markdown table and move it to see if you can move it to a new topic or only to an existing topic?
Probably you have some plugins or themes that are interfering.
As a workaround for the problem you can copy the post from Community Notice | Freetrade, delete the original post, paste the content in a new topic and ask an admin to change the ownership of the topic to the original author.