Hi,
The javascript error comes from a conflict of jQuery libraries on your website and is not coming from a bug in HikaShop. It's only a consequence of the conflict. Installing and configuring the extension jQuery Easy usually fix that.
But that error is not linked to your problem. I suppose that you must have configured the settings in the "HikaShop options" tab of your module in a wrong way.
You probably have the "synchronize" setting activated in there which actually makes your module display differently based on the page you're looking at and you want to turn off that option.