problem - REQUESTERS have no SITE assotiation

problem - REQUESTERS have no SITE assotiation

REQUESTERs don't have SITES. when I tried to fill field SITE in edit REQUESTER - it's possible, but disappearing after saving. when I created new user with adding SITE to it (test),  it possible to view in detail view, but not visible in LIST VIEW. without connection to the SITES requesters is like a mess and, when creating new incident, SITE not choosing automatically after choosing REQUESTER.
please advice me about this problem...
I connected attach in which possible to view the sample - in detail view requester have site - in list view - no.
please explain what's wrong with this thing.

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