before added i could click on the checkbox and it worked but now i can't when i click on the checkbox it click on the link_show'. how i can fix it?

Example:

<a href="{{ path('link_show', {'id' : item.Id}) }}">

    

<div id="a">

    <div id="b"></div> 

</div> 

 <div id="listado_hipotesis_preferido">

        <form class="gf-form" method="post" action="./">

            <ul class="gf-checkbox">

                <input data-role="none" type="checkbox" id="checkbox-1" /><label for="checkbox-1">

            </ul>

        </form>

    </div>