not working correctly

There are several tables on the page and <br/> after each table, all work correctly except for the last one.  The table shows up beside the last table, checked site.master and panel and there is plenty of room for the last table.  Everything works correctly in VS 2010 but not from the web browser.
<asp:Content ID="HeadContent" runat="server" ContentPlaceHolderID="HeadContent"></asp:Content>
<asp:Content ID="MainContent" ContentPlaceHolderID="MainContent" runat="Server">     <asp:Panel ID="pnlMain" Height="1200px" runat="server" BackColor="RosyBrown">         <asp:Table ID="tblPractice" runat="server" BorderColor="Red" BorderWidth="5px"> </asp:Table>
        <br />
  ...