Faces: af:SelectOneChoice showing spurious blank line

Hi,
I have a selectOneChoice, bound to an ADF list binding, that is showing an extra blank line. It's supposed to show one--I've selected "Include Blank Item" to allow selection of a null value--but it's actually showing two; that is, there are two blank selection items in a row.
They behave differently, too: the first one has a value of "null", as it should, but the second has a value of 0. I've checked my model layer using the Business Components tester, and there's nothing in the list that would explain the blank item (that is, all items have non-null, non-blank values for the display attribute). I've also got several other selectOneChoices, and none of them are behaving this way.
In case it's any help, my JSPX code:
<af:selectOneChoice id = "sizeList"
autoSubmit="true"
valueChangeListener="#{viewPromoBean.applySize}">
<f:selectItems
 value="#{bindings.PromoProductsManagerItemSize.items}"/>
</af:selectOneChoice>...and my list binding (from the page definition):
<list id="PromoProductsManagerItemSize"
IterBinding="PromoProductsManagerIterator" StaticList="false"
ListOperMode="0" ListIter="AvailableSizesIterator" NullValueFlag="1"
NullValueId="PromoProductsManagerItemSize_null">
<AttrNames>
 <Item Value="ItemSize"/>
</AttrNames>
<ListAttrNames>
 <Item Value="ItemSize"/>
</ListAttrNames>
<ListDisplayAttrNames>
 <Item Value="Display"/>
</ListDisplayAttrNames>
</list>

Anyone?

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Questions regarding Internet Explorer 8, 9 and 10 and Internet Explorer 11 for the IT Pro Audience. Topics covered are: Installation, Deployment, Configuration, Security, Group Policy, Management questions. If you are a consumer looking for answers or to
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Faces: af:SelectOneChoice showing spurious blank line

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