Variation buttons Critical incompatibilities on shop page

Hello, 
i have a problem – with the variation buttons. (or i had it for a long time – but we never knew it was you plugin)
Please check this site – http://caseify.shop/produkt/waikiki – The price should show the right variation style – if the plug in is deactivated it works.
also here if the yith slider and you plugin are activated on one page. the variation does not work anymore. http://caseify.shop/produkt/yith-sea-case