[Twentyten] Image with link unclickable!

Hi,

I have made a theme using Twentyten. But it has a weird problem.
On my contact page I have got a Linkedin image.
Most of the image is unclickble, only the very bottum will link to the website. I justed a normal HTML code, and looked for almost 45 minutes to find the problem, can anybody find it?!

Link to the website:
https://ooii.nl/contact2

Code I used:

<a title="First Name" href="https://nl.linkedin.com/pub/xxx/xxx">
<img src="https://ooii.nl/wp-content/uploads/2012/04/linkedin.png" width="64" height="64" /></a>

Note:
If I put it twice on the site, the second one is clickable..