Validation button isn't firing

Something strange is going on. I have requiredfieldvalidators on 2 textboxes. I enter data and I cannot click the asp button. but when i remove the validation group I can click the button.


<fieldset class="ajaxFieldSet" > <legend>Personnel Impact</legend> <asp:HiddenField ID="hidPersonnelId" runat="server" Value="-1" /> <div class="divPersonnelColumn1"> <label for='<%= personnel_txtPersonnel.ClientID %>'>Personnel</label><asp:TextBox ID="personnel_txtPersonnel" runat="server" /><asp:RequiredFieldValidator runat="server" ID="reqPersonnelText" ControlToValidate="personnel_txtPersonnel" ToolTip="This is a required field" ValidationGroup="personnelValidationGroup& ...