Hi,
The products display in double because you have a product listing menu and that in the "associated modules" option of that menu, you have a products listing module which is enabled. Thus, both are displaying the products.
So you should go in your menu's hikashop options and deactivate that module from that option.
You can find that screen via the menu Display->Content menu by editing the menu with the id 107.
For your problem with the categories on the left, you should go in the menu Display->Content module and edit your module with the id 29. There, change the "menu" option to a hikashop products/categories listing menu and that should do it.