ASP compare validatory type=currency

I have 3 currency type inputs in a form. Here is the code:
When I change the amount in one of the fields and update, the compare validator kicks off on existing valid data also and gives the error message. I have to edit the field removing 2 extra decimal places.
<table width="100%" border="1" cellpadding="15" > <tr align="left"><td> <asp:Label ID="label4" runat="server" Text="Cash Amount:" /> <asp:TextBox ID="dsCash" runat="server" /> <asp:CompareValidator ID="cv1" ControlToValidate="dsCash" runat="server" ErrorMessage="Amount must be Numeric" Operator="DataTypeCheck" Type="Double" /> </td></tr> <tr align="left"><td> <asp:Label I ...