Logo header

Hi,
I’m with a little trouble with my logo in the header of my site
My site is this one: http://pimentaesal.com.br/
I put the logo in the header.php of the my theme, it was working. Now I change my website of server and this process I don’t what I did that the logo is noting more appearing.
I try a some things:
1 – I change the archive header.php for the original one.
2 – I upload a new Image for the logo and change the link

When I open my website I can see my logo for few seconds and than it disappears.
If I see my Code Font I can see my link of my logo image.

What could be wrong?