When Posting Adsense after post it disappears in sidebar

I used this method:

https://www.tamba2.org.uk/wordpress/adsense/

To place adsense after the first post on my page:

https://ambztheripper.pointlessbanter.net
and also on this page
https://tamedanus.pointlessbanter.net

(Both pages use swearing just as a word of warning)

Now the ad on the sidebar doesn’t show up.
I have less than 3 ad codes on the pages so I know it isn’t that. I am stumped. Any help would be appreciated.