Just found out that “options-page.php”, just at the very beginning sets the $page variable which messes with the pagination. The $page variable is used by WordPress to detect the current page number for paginated results, so can you please refactor the code to use another variable name?
I am using ACF v5 latest version.
If you are still having the same issue.
Kindly update to the latest version and let me know if you still have the bug