Filters not behaving as expected

[kosarko]

filters don't return what I'd expect them to...https://lindat.mff.cuni.cz/repository/xmlui/discover?rpp=10&etal=0&group_by=none&page=5&filtertype_0=author&filter_relational_operator_0=contains&filter_0=Haji%C4%8D%2C+Jan (the first item in the list does not have Jan Hajic as author)...added this through advanced search new filter, author contains...start typing haj and use the autocomplete