problem with page box

To add the plugin to your post/page add only <!--facebook-page--> this code to your “text” view mode instead of “visual” mode from your admin panel. And set other settings from “Settings -> Facebook Page”

Please see
https://awesomescreenshot.com/09c53xhd9d
and
https://awesomescreenshot.com/00153xhhcc

without effects: https://www.krakownanowo.pl/kontakt/

Ok it seems all correct. Can you provide us the wordpress version you are using and which other plugins on the page? And now your page is not opening, its redirecting to https://www.krakownanowo.pl/info/

WordPress 4.2.3 PL
I’ve tested your plugin with only Manage WP worker and limit login plugins yesterday. Rest was off for tests. Today all plugins were disabled.

Ok it should work well in WordPress 4.2.3. We have already tested it in this version. We have checked your site and it seems that some script has been changed in plugin files. We suggest you to delete and install the plugin again.

done… https://www.krakownanowo.pl/kontakt/