'Unlike' button in Forum not working

I can Like posts but I can’t Unlike them.
After the Like, the button is disabled and even removing the attribute it is not possible to undo the action:

<button class="widget-button btn-flat toggle-like has-like fade-out no-text btn-icon" title="you've liked this post" disabled="true" data-post-id="2078328">
	<svg class="fa d-icon d-icon-d-liked svg-icon svg-node" aria-hidden="true">
		<use xlink:href="#heart"></use>
	</svg>
</button>