i have a plugin on the website that shows post thumbnails. (recent post with thumbnail)
The plugin has the option to show a sticky post on top, but somehow it will not do this.
The owner of the plugin asked if my theme maybe interferes. He asked if there are any files with sticky features in the theme that can stop this from happening?
no the Theme does not interfere with how WordPress sticky posts works.
Your site is built using a page builder – which looks like it is replacing the standard wordpress content which could be the issue.