Behaviour CSS menu in IE

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Good afternoon all of you,

(concerning: )
I've made a CSS styled menu (on the left side of the page underneath
'products') and it's working correctly in all browsers but IE.
If the user puts his mouse from 'Item one' to 'Subitem one' the
hover-statement makes this submenu jumping a little bit up. It's only
behaving that way in IE.
Why does this happen and is there a solution for it?

Thanks in advance.

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