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.
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.