CascadingDropDown Selects Wrong Item on PostBack

I have a page where the cascadingdropdown is selecting the wrong item in the list on postback. I can verify that the JavaScript created by the AJAX controls says to select item "5::Description Here" yet item 4 gets selected when the page loads after post back. So you select the parent value, then the child, then click a button that does a postback (in this case a search) and when the two drop downs load the first one is selected correctly and the 2nd one, the cascading drop down, has selected the item above the correct item. If I continue to submit the form over and over the selected item just keeps moving up one spot. I attemted to remove any appended items, in my case one that says "-- Select --", as well as the prompttext as it appears to be an "index" issue, but that didn't solve the problem. I have the exact same dropdown fields on another form where they work just fine on postback. I don't want to post the whole page but here are the dropdowns in question. OfficeLocation is the parent and RateSchedule is the child.

<asp:DropDownListID="drpOfficeLocation"runat="server"AppendDataBoundItems="True"DataSourceID="srcOfficeLocations"DataTextField="Value"DataValueField="ID"Width="150px"EnableViewState="True">

<asp:ListItemValue="">-- Select --</asp:ListItem>

</asp:DropDownList>

<asp:DropDownListID="drpRateSchedule"runat="server"AppendDataBoundItems="True"

DataTextField="Value"DataValueField="ID"EnableViewState="False">

</asp:DropDownList>

<cc1:cascadingdropdownid="ccRates"runat="server"category="Location"

loadingtext="Loading Rates..."parentcontrolid="drpOfficeLocation"

servicemethod="GetRateResults"servicepath="JobAJAX.asmx"targetcontrolid="drpRateSchedule"></cc1:cascadingdropdown>

You simply won't believe what I found to be the problem. My controls are in a table that has style="display:none;" and you click an image to show the table. Removing this "display:none" from the table allowed the JS to select the correct item in the dropdown. I added it back and it selected the wrong one again. I can't make any sense of this but that's the problem.