Ok i dug deeper into it myself.
I found the source of the problem.
Addons.css
.clearfix:after{ /* FF, O, etc. */
content: “.”;
display: block;
height: 0;
clear: both;
border: 1px solid red;
}
the content: “.”; makes Opera do the automatic jumping.
If i remove the code it is resolved.
However then the layout breaks in all other browsers including Opera.
So if i leave the content:”.”; into it and i change the top margin to 35px, then the problem is also solved, but everything is spaced out.
So there must be a way to exclude Opera and have a work around for that browser.