Issues with hero section and single post titles after WP 6.6

Hi, after we updated to WP 6.6, have had issues in getting the single post title templates to show the right color – despite multiple attempts to change just the title color, it still reverts back to black on the live page (would like it to be white): Also, the hero section seems to have broken for PC browsers and mobile - the column and text and image blocks don't seem to load, despite looking OK in the editor. Any help please? This is our site: https://robertrenke.com/ Thanks!