If you are going to use veronika theme, then uninstall zara configurator plugin.
You have javascript error on your site that reference to osclass core:
Uncaught Error: Cannot find template script at ID 'qq-template'!
at parseAndGetTemplate (jquery.fineuploader.min.js:6)
at new qq.Templating (jquery.fineuploader.min.js:6)
at new qq.FineUploader (jquery.fineuploader.min.js:6)
at getNewUploaderInstance (jquery.fineuploader.min.js:3)
at init (jquery.fineuploader.min.js:3)
at HTMLDivElement.<anonymous> (jquery.fineuploader.min.js:3)
at Function.each (jquery.min.js:2)
at init.each (jquery.min.js:2)
at init.$.fn.fineUploader (jquery.fineuploader.min.js:3)
at HTMLDocument.<anonymous> (new:614)
Please disable plugins you are using like minimizer that everytime breaks osclass javascripts.