I haven’t been able to consistently reproduce this bug yet, but often when I change the site language from Persian to English or vice versa, the radio filter is displayed in two languages ​​at the same time. Please see the screenshot below.
Polylang was previously enabled, but I removed it a long time ago. I don’t think it has any effect on this bug, but in general, by changing the site language, I meant changing the language in WordPress settings. Sorry I didn’t mention it.
As we discussed via email, this doesn’t seem to be a specific issue and I can’t consistently reproduce it yet. I’ll update here if I get any new details.