Smart filter Bitrix does not filter by one property, but filters by the rest. How to be?

Question

Figma

Dear friends, tell me please. There is a site, dicentre.ru/katalog/sotovye_telefony , a smart filter is installed on it, which filters wonderfully, by all properties, except for "OS Version". Anyone have any ideas why this is happening? Already broke my head. Faceted indexes were redone, the cache was reset ... The most remarkable thing is that when you select any OS in the filter, the filter itself shows that it found n-number of elements from such an OS, but does not display them in the list of products, although with other properties of such a problem No....

Answer 1

This is due to slow internet, in rare cases with errors in figma.

Answer 2

Get rid of the plus in the url:
/katalog/sotovye_telefony/filter/versiya_os-is-android + 6.0/apply/
/katalog/sotovye_telefony/filter/versiya_os-is-ios + 8.0/apply/