It’s because you copied and pasted all of the # characters from the original post. I don’t know why they were there in the first place, but you need to remove them all. Oh, this entire post is source code! smh
Copy your post text into a text editor and and Find/Replace all the number signs the paste the result pack into your post. Better yet, just delete this post.
How headings work in Markdown:
Starting a line of text with a number sign indicates a heading, with a single number sign being the largest heading.
One number sign
Two number signs
Three number signs
Four number signs
Five number signs
Six number signs
####### Seven number signs is too many and you just get a sixth level heading with a visible number sign.
Source for the above:
<span style="color:#323232;"># One number sign
</span><span style="color:#323232;">
</span><span style="color:#323232;">## Two number signs
</span><span style="color:#323232;">
</span><span style="color:#323232;">### Three number signs
</span><span style="color:#323232;">
</span><span style="color:#323232;">#### Four number signs
</span><span style="color:#323232;">
</span><span style="color:#323232;">##### Five number signs
</span><span style="color:#323232;">
</span><span style="color:#323232;">###### Six number signs
</span><span style="color:#323232;">
</span><span style="color:#323232;">####### Seven number signs is too many and you just get a sixth level heading with a visible number sign.
</span>