Resolved
Resolved in: JetSmartFilters by Crocoblock 2.3.13
Overview of the issue
In some cases, the filters created by the plugin JetSmartFilters by Crocoblock are not working properly or are not translated on front-end.
Workaround
The issue is fixed by the author. Please make sure you are using JetSmartFilters by Crocoblock version 2.3.13 or later.
Keep in mind that if that plugin is bundled with a theme, you should contact your theme support and ask them to update to the latest version.