Button on the master page

How can we help if you haven't provided anything relevant to work with?

Youi should provide proper css for all the buttons either they are fixed or floating. First check it out otherwise post related code here...

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Admin Login.aspx.cs" Inherits="Admin_Login" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    <style type="text/css">
    .style2
    {
        width: 100%;
        height: 652px;
    }
    .style3
    {
        height: 108px;
    }
    .style4
    {
        width: 363px;
    }
</style>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <table class="style2">
    <tr>
        <td bgcolor="White" class="style3" colspan="2">
            <asp:Label ID="Label5" runat="server" BackColor="White" BorderWidth="0px" 
                ForeColor="Black" 
                style="z-index: 1; left: 3px; top: 46px; position: absolute; font-size: large; font-weight: 700; font-family: Calibri; vertical-align: middle; letter-spacing: 1pt" 
                Text="Welcome!"></asp:Label>
        </td>
    </tr>
    <tr>
        <td class="style4">
            &nbsp;</td>
        <td>
            <div style="z-index: 1; left: 433px; top: 182px; position: absolute; height: 289px; width: 519px">
            </div>
            <asp:LinkButton ID="LinkButton1" runat="server" 
                style="z-index: 1; left: 437px; top: 499px; position: absolute; vertical-align: middle; letter-spacing: 1pt; font-size: small; font-weight: 700; font-family: Calibri; height: 19px">Forgot Password</asp:LinkButton>
            <asp:Button ID="Button16" runat="server" BorderColor="#0066FF" 
                BorderStyle="Groove" BorderWidth="2px" ForeColor="Black" 
                style="z-index: 1; left: 862px; position: absolute; height: 26px; font-size: medium; font-weight: 700; font-family: Calibri; vertical-align: middle; letter-spacing: 1pt; top: 497px" 
                Text="Sign In" />
        </td>
    </tr>
</table>
</asp:Content>

above is the code for my master page,the buttons that are the misplaced are the menu items :)

check ur CSS file,

It does not seems to be your master page content Because your menu items Style or css is not mentioned anywhere so plz provide ur masterpage once.I think this is your page content which inherits the master page.