Hi @donnafefe
Make sure that you’re actually just getting image ids with this:
$image_ids = get_field('imggal', false, false);
Also, does it work with the limit plugin deactivated? Maybe it also limits images to those uploaded to the post.
In the end it seems more like an issue/bug with the gallery shortcode in WordPress than ACF. If you truly are getting all 6 attachment IDs with the above code ACF is doing it’s part correctly.