Yes, there no update alerts in plugins.
Actually, I research the problem and have some answers for you.
This bug appear because in file class-frontend for “rel” used “298 ++ $this->gallery_no”;
And in case for ajax there are two galleries with identical rel. I propose to use the POST id, maybe with this simple numeration.
In that case rel will be always unic. I didn`t get how to change this in class-frontend, so I did some hack in functions.php with gallery shortcode and use only ID because I have only one gallery per post:
$output = str_replace(‘ID.'”‘, $output );
//THIS WILL WORK. You can check it now.
But It will give some troubles for more galleries, so I will hope for new updates.