Master Page Length

I am converting an ASP.Net/C# to use master pages.  One of the aspx pages is very long and have divided the information into tables to display depending the what the user enters.  Problem I am having is that after display first two tables the third table is put along the side of table two.  I have "<br/>".  Is there height limitation for master/aspx pages?
 
<%@ Register TagPrefix="cc1" Namespace="MessageDisplay" Assembly="msgBox" %> <%@ Page Title="Incident Report Form" Language="C#" AutoEventWireup="true" CodeFile="IncidForm.aspx.cs" Inherits="IncidForm" MasterPageFile="~/SiteAdmin.master" MaintainScrollPositionOnPostback="true" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %> <asp:Conte ...