@danieliser, I went through my whole polylang configuration and I couldn’t find anything such as “enable for custom post type” or anything like that.
Therefore i went ahead and checked the database. For what I briefly gathered, in the wp_postmeta table, there’s no “lang_en” or “lang_XX” entry for the popup posts, nor do I see the usual polylang interface on the popup maker backend.
I’m not sure whether is a popup maker issue or a polylang issue, but if you, polylang developers or anyone else could look into that, I’d be very grateful