Hello,
Sorry for the delay in answering.
1) Update the theme to 8.0.2 and Core plugin to 4.0.2 https://www.8theme.com/documentation/xstore/theme-installation/theme-update/ https://www.8theme.com/documentation/xstore/plugins/plugins-update/
Clear cache and check filters then.
2) Try to disable all the third-party plugins (including cache plugins), that do not come bundled with XStore https://www.8theme.com/documentation/xstore/plugins/included-plugins/ , clear cache, and check how it works then.
If both advices don’t help, provide temporary FTP access, so we can take a closer look.
Regards