Clickable header problem

Hello,
I made my theme header clickable using the following code on a child header for Minimatica theme:

<div id="headerimg" onclick="location.href='http://dyangrey.com/commercial/" title="Return to Homepage!" style="cursor: pointer;">

It works in part of the pages and posts but not on most of them.
Iv verified the relevant files have the “get header” and I even modified the header file on the father theme but the result is the same.
Same result on 3 different browsers.

I did notice an error on the code when I “inspect element” saying:
event.returnValue is deprecated. Please use the standard event.preventDefault() instead.

any ideas what could be the problem?

this is my site.