Hi,
I encountered a very strange bug today, and am still able to replicate it.
On my website’s home page, it was duplicating all of the content and displaying it twice in a row. I managed to fix this on that page, but wanted to report the issue.
The page has three [recent_posts] shortcodes in text elements, set in three rows with various offsets, creating a 3x3 grid of recent posts. The issue only stopped when I changed one of those text elements to use the Recent Posts element instead. It didn’t seem to matter which one I changed, but as long as there were three of those shortcodes on the page, it duplicated the content.