This is a current problem with ACF and WP.
The issue is that when you download and import attachments from an xml file, the new WP install will insert the media data into the DB with NEW ID’s.
These ID’s will then not match the ID’s saved in the ACF values…
The quickest fix, is to edit the posts and re assign the images.
If you feel up to it, you could go through the DB wp_postmeta table and replace the old ID values with the new ID value?
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