problem with the "CalendarExtender" that displays just two days of week

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ASP.NET

Ajax

controls

I used the "Ajax:CalendarExtender" to select date inside a asp page, but the problem i encouter is that the calendar just display two day of weeks, for each week displayed it displays just the Monday and the thusday days.

<asp:TextBox ID="txt_cldr" runat="server"></asp:TextBox>

<Ajax:CalendarExtender ID="cldr_dateNaissance"  runat="server" 
Enabled="True" TargetControlID="txt_cldr" PopupButtonID="imgParametre_dateParametre" Format="dd/MM/yyyy">             </Ajax:CalendarExtender>    
        
<Ajax:MaskedEditExtender ID="msk_cldr_dateNaissance"  runat="server" 
TargetControlID="txt_cldr" Mask="99/99/9999" MaskType="Date" Enabled="true"></Ajax:MaskedEditExtender>

<asp:Image AlternateText="calendrier" ID="imgParametre_dateNaissance" ImageUrl="~/images/calendar.png" runat="server" /> 

<asp:RequiredFieldValidator ID="rf_dateNaissance" runat="server" ControlToValidate="txt_cldr"                 ErrorMessage="*"></asp:RequiredFieldValidator>