link in the menu does not fill all the Item(button)

Hi,

I notice a very strange thing : I have 2 accounts (web site) on smug mug, and with the same CSS code (copy paste) on the 2 site for the menu customizing, there is a little difference which make me crazy :

see capture Site1 Site 2 ITEM 100px.jpg : http://dgrin.com/attachment.php?attachmentid=40102&stc=1&d=1440332451

- on the (SITE1), the a href of the main menu do not fill the all item.

the item is 113 px and it is not in the CSS code

- on the SITE 2 , the CSS code is exactly the same ( COPY PASTE), and I do
not have the problem

The href link fill all the item and it's better

In the code, the 100 px width is only for a href. No padding, no margin.

It's incomprehensible that on the SITE 1 it's wrong, and on the SITE 2 it's
good, with exactly the same code.

I do not know if there is a solution ? Perhaps delete the menu and begin again ?

Etienne