Post header clickable in Chrome but not in FF en IE

Hi,
i hope somebody has the answer to the following problem,
my post headers are clickable links to the whole article.

but the “header link” is only working in chrome and not in internet explorer or firefox. when hovering over te link it also doesn’t react as a link. but in Chrome it does

i hope somebody has the answer to this, cause it very frustrating

thanks in advance