Bizarre complication, need help…

Heya – so I’m working on this site: https://jen-novak-consulting.theportlandco.com/category/charity

And if you click on the words/logo in the top left, in Safari it will take you home, but in Firefox it won’t. This is the exact code I’m using:

<a href="/index.php"><img src="/wp-content/themes/jen-novak-consulting/images/logo.png" class="logo" /></a>

But if you look at the source in Firefox it says my “” aren’t even there! How is this happening??