Characteristics change make product img disappear

-- url of the page with the problem -- : n.a
-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.4.4
-- PHP version -- : 5.5.12
-- Browser(s) name and version -- : Firefox 40.0.2
-- Error-message(debug-mod must be tuned on) -- : N.a

HI;

I new to Hikashop, but not new to rpogramming.
So I know php,js, hmtl, css, etc...

My problem is on the prodcut details page, when I change the characteristics ( ex: size, color) the image gallery I have implemented dispappears - or more precisely once the characteristics ajax call is complete it doesn't reload my gallery script so the width of all my images doesn't get calculated. I using slick.js and I also tried flickity.js too, but I get the same problem, as I beleive both script want to dynamically set the height of the viewport, which get changed from

height="689px;"

height="0px"