Merchant and Brand not show ver.4.5.6

hi,

After updating 4.5.6, brand and merchant list not showing on Search Product Options.

here is the preview

I don’t know it’s because of last version update or because i change http to https on my site. Because after i change my site to https, ProsperInsert in add post not work. But i was resolve it with editing php file on plugin directory (sorry i’am forgot what php file name) and manualy change http to https in php code.

Any advice to resolve brand and merchant list not showing on Search Product Options?