Possible AutoPostBack Issue

I have a radio button control and a checkbox list control that both will display 2 separate textboxes based on the value selected. The problem I am having is when you select a radiobutton selection and the text box displays then you move to the next question ans select the value that makes the other textbox display, the previous textbox is disappearing. I have autopostback set to true for both controls. Has anyone seen this occur before?
<asp:RadioButtonList ID="rbJobStatus" runat="server" OnSelectedIndexChanged="rbJobStatus_SelectedIndexChanged" AutoPostBack="True"> <asp:ListItem>New Job</asp:ListItem> <asp:ListItem>Update Previous Job</asp:ListItem> </asp:RadioButtonList> <asp:CheckBoxList ID="cbTargetAudience" runat="server" CssClass="label" Width="30 ...