You’re welcome!
1) It was a bug and fix for this will be added in the next update of the theme.
2) Please check the page of a single brand now.
“8theme brand permalink settings” option can’t be re-saved (changed) via Settings > Permalinks in your Dashboard. “brand_custom_base” was set as “page_id4402” in the database. We’ve changed “page_id4402” to “shop” (via files of Core plugin) so now “brand_custom_base” is “shop” in the DB.
The problem with changing “8theme permalink settings” can be caused by some of your security plugins or server settings.
Regards