There was a flexible content container with the content inside that required an extra loop to reach the content. This helped (https://support.advancedcustomfields.com/forums/topic/get-another-pages-flexible-content/)
<ul class="rslides_m16 rslides">
<?php
if( have_rows('page_modules', $postID) ):
while ( have_rows('page_modules', $postID) ) : the_row();
if(get_row_layout() == "2-carousel-featured"):
if( have_rows('items') ):
while ( have_rows('items') ) : the_row();?>
<li>
<img src="https://wordpress.stackexchange.com/questions/231217/<?php echo get_sub_field("image');?>">
</li>
<?php endwhile;
endif;
endif;
endwhile;
endif; ?>
</ul>