I guess Brenden pointing right thing but not fully correct it should be like this because Alex using two different control i.e. Search Dialog and Search Result.
filters are tied to dialog and dialog tied to result. So in your SearchFilter, set the SearchWebpartID = SearchDialog and in SearchDialog, set the ResultWebpartID = SearchResults.
<cms:SearchDialog ID="SearchDialog1" ResultWebpartID="SearchResults1" />
<cms:SearchFilter ID="SearchFilter1" SearchWebpartID="SearchDialog1" FilterMode="Text box"/>
<cms:SearchResults ID="SearchResults1" />
Happy to help you