You can see it under http://ll-bio.de/ since were all blue headings in the green of the logo but after the update all headings are blue, although in the settings the value of # 94c369 (green) is deposited.
Please excuse me for suspecting the bug on your theme. It was the elementor update. Such color settings should of course not even change there by an update, but you are really not to blame. Thanks for your tip.