links broken after MySQL id reset

Good morning.

I have done a search and don’t seem to be able to find anything related to my problem.

I use custom permalinks /%post_id% so that each post is sequential, my blog is very simple https://engtect.net

a few days ago I created a page, played with it and then deleted it as it took up a post id and so messed up my layout. I then went into PHPMyAdmin to reset the post id so that the next one would be correct. I.e. my current post was 28 so I changed the next auto increment from 30 to 29.

This morning I make a post and the link to it will not work, be in from the font page, a single page or in the admin area.

I have had a little look around phpmyadmin for clues as to what I have messed up but am none the wiser. Any ideas?