Thanks for the quick reply Yigit, I was hoping to find a different solution than dequeuing the whole shortcodes.css.
If I do that, it works. But please notice the handle for that CSS is avia-scs, not avia-shortcodes.

The proper code, for anyone else who needs it, would be

add_action( 'wp_enqueue_scripts', 'wp_change_shortcodescss', 20 );
function wp_change_shortcodescss() {
  wp_dequeue_style( 'avia-scs' );
  wp_enqueue_style( 'avia-scs-child', get_stylesheet_directory_uri().'/css/shortcodes.css' );
}

Best,
Luca

Hi Yigit, thanks for the quick reply.
As i added it happens without WPML too. Will ask for your help once moved from my local machine.
Luca

My bad, that happens even without WPML

Hi Peter,
i bought the blog version and looks like I’m not entitled to download betas.
I solved it by temporally downgrading WP to 3.8.3 and works fine so far.
Thank you,
Luca