Welcome to NGA, DrReneigh. I looked around and saw that, except for the Issai variety, Actinidia arguta (winter hardy to z3) , Actinidia deliciosa (this one reaches the limit of its winter hardiness in Snohomish's USDA Zone 8a) and Actinidia kolomikta (winter hardy to z4) require a male and female plants:
http://www.missouribotanicalga...
http://www.missouribotanicalga...
http://www.missouribotanicalga...
I would check which variety of kiwi you are growing in order to confirm if your variety needs a female. If you get the information from paper records, see if you can somehow confirm that the plant was not mislabeled. Or if you know of a female in bloom at the time your plants are also in bloom, you might want to pollinate "manually" to see what happens. I have not tried doing that though.
I assume that you do not have any issues with kiwi pollinators (lack of... if the variety requires male+female), temperatures that go up & down or with cool wet weather sometimes.