Actual behaviour
The space filter is intended to work with one Personal space. Since Kiteworks accounts are multi-personal, whatever is typed in the filter shows only the first space in the list. That's because the Personal space takes this place and it is pinned to that position in oC servers.
Expected behaviour
Set up the filter in a different way. If server is oC, current behaviour. If server is Kiteworks, filtering with no restrictions about Personal spaces. Just showing spaces which name matches the input.