Missing button shortcodes

I have buttons on my site, they are still there. When I went to edit them in my appearance area of my themes, I found the maxbutton shortcode. So, I went to maxbutton plugin to edit that button. None of my buttons shortcodes are listed. I did see this warning at the top:
Warning: mysqli_real_escape_string() expects parameter 2 to be string, array given in /home3/cracker/public_html/northeastfloridalife.com/wp-includes/wp-db.php on line 1102

I updated my php to 7.2. Still no existing buttons.