Hello,
1) Provide me screenshot of the element in your content where you used product categories and that code does not work.
2) Looks that problem is related to a3 Lazy Load plugin, if we inspect image in Chrome we can see the following styles of the plugin http://prntscr.com/lnir2v
Once I check your site in Safari I don’t see that code anymore because “lazy-loaded” class does not appear for that image. I don’t know why this happens for the Safari. Either disable that plugin or contact plugin author to solve the problem.
Regards