CSS - web page moves when certain areas are clicked

I have set up a Nav Bar in CSS. When I test it live, certain links are fine. When I click on the link that has a submenu, the web page jumps.

nav {
position: relative;
width: 825px; /**adjust width as needed**/
margin: 0 auto;
padding: 0;
text-align: center;
border: 1px dotted blue;

nav ul {
margin: 0;
padding: 0

nav li {
list-style: none;
font-size: 12px;
float: left;
text-align: center;

/**top level menu**/
nav li a {
display: block;
text-decoration: none;
margin-right: 9px; /* space between links */
margin-left: 6px; /* space between links */
width: auto; /* adjust as needed or use auto */
padding: 25px;
font-weight: bold;
line-height: 1.50em;
border: 1px dotted #666;
border-top: none;

/**alternating background colors**/
nav li:nth-child(odd) > a { background: #6684e0	}
nav li:nth-child(even) > a { background: #e3c384}

/**top menu style on mouse over**/
nav li:hover > a{
color: #FFF;
background: #c0d5db;

nav li ul {
display: none;
text-align: center;
margin: 0;
padding: 0 1em;
background: none;

/**sub-menu, help for older IE**/
nav li:hover ul, nav li.hover ul {
display: block;
position: absolute;
padding: 0;

nav li:hover li, nav li.hover li { float: none; }

/**drop-menu style**/
nav li:hover li a, nav li.hover li a {
width: 9em; /* adjust width as needed or use auto */
margin-top: 0;

/**drop-menu style on mouse over**/
nav li li a:hover {
color: #667edc;

/* Clear floated elements at the end*/
nav:after {
visibility: hidden;
display: block;
font-size: 0;
content: " ";
clear: both;
height: 0;


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Wanda MarstonCreative DirectorAsked:
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Alicia St RoseOwner & Principle Developer/DesignerCommented:
Please provide a link to the site.
Wanda MarstonCreative DirectorAuthor Commented:
Prasadh BaapaatWeb Designer & DeveloperCommented:
i don't see the page jumping (a jerk or shake kind of thing) when I click on links...
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Wanda MarstonCreative DirectorAuthor Commented:
It always has for me. I have only tested it in Firefox and I am on a Mac - if that makes any difference.

Alicia St RoseOwner & Principle Developer/DesignerCommented:
Hi wchirnside,
are you on a macbook air or google chromebook? Those devices have short screen heights.
The page will jump if the height of your browser window is short. The jumping is caused by the scrollbar appearing to accomodate the dropdown menu.

On a 17 inch macbookpro. No jumping. When I shrink the browser window I get the jump when the scrollbar appears.

This isn't a bug. Just the way things are. If it bothers you, then give the #wrapper a min height so that the scrollbar is available from the get-go.

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Wanda MarstonCreative DirectorAuthor Commented:
Thank you! Didn't think of that but that makes perfect sense.

I am on a small Mac Book Pro so the window is probably too short.

I am trying to get ALL the bugs out of my site - bug by bug - before I go on to the next stage.
Wanda MarstonCreative DirectorAuthor Commented:
Thanks for the quick solution.
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