Table in custom content covering whole page

I have a master page which an area for custom content, this works fine of all pages except one, in which I have a table.  The table has 'jumped' out of the custom content area and is covering the whole page [:-S]:

 1 <%@ Page Language="C#" MasterPageFile="~/COSHH2008.Master" AutoEventWireup="true" CodeBehind="newAssessment.aspx.cs" Inherits="COSHH2008.CARQ" %>
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5 <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
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8 <%-- <span class="asses ...