I’ve disabled all of my plugins. There are these lines in my functions.php:
remove_filter('the_content', 'wpautop'); remove_filter('the_excerpt', 'wpautop');
But WordPress still adds random
tags to the source without the opening tag. I’ve tested this site a few updates before, I have not noticed anything like this. The theme written by me. Thanks for you help.
This problem only exists on post edited with HTML. No random tags in post written in visual editor.
Read more here: WordPress adds random </p> tags to the source