CMS Made Simple Forums

Hello,
I just made my first website with CMS Made Simple.
I have just one small problem with the style sheet, at least I think this causes the problem.

When I send one an e-mail with the link to the site http://www.plezierinprestatie.nl/cmsms/, the site shows differently (wrong) than just typing the URL and pressing enter in a browser.
When following a link the menu is aligned left, instead of in the wrapper div. The strange this is, after hitting refresh, it looks alright.

What can cause this? Thanks for your help.

Tom.

I think you need to clean up some errors in your html then work on the CSS, and your layout is in need of some major rework...

Result: 0 errors / 11 warnings

line 132 column 19 - Warning: missing before
line 133 column 4 - Warning: inserting implicit
line 134 column 36 - Warning: discarding unexpected
line 134 column 98 - Warning: missing before
line 135 column 1 - Warning: inserting implicit
line 135 column 1 - Warning: missing before
line 135 column 84 - Warning: inserting implicit
line 153 column 1 - Warning: discarding unexpected
line 19 column 3 - Warning: anchor "menuwrapper" already defined
line 132 column 19 - Warning: trimming empty
line 135 column 1 - Warning: trimming empty
Info: Doctype given is "-//W3C//DTD XHTML 1.0 Transitional//EN"
Info: Document content looks like XHTML 1.0 Transitional