Hello, any help/suggestions with this?

I am configuring a Smithcart site.
(latest paid for vers, with latest DNN) I am using both Categories, and Brands menus.

The categories have some subcategories under them (not all of them)

When I click select a Category item,  ALL the subcategories under ALL the categories expand to become visible. I thought that only subcats under the category you select should become visible?

Whenever I pick a Category to click on it does not highlight that category/or sub category if selected, (another subcat within a different Category 'lights up', so a visitor does not know what has been selected. unless you view the URL)

If I select a product in that category, then I go to the product page the menu then collapses to what it was before visiting it. So the visitor cannot tell what Category they are looking at.

Also, after uploading a list of products I cloned ONE product and it appears to have broken the system in that ALL of my product URLs now have a completely unrelated category name in the URL path. I cannot remove the path item and as I said it shows on all products despite not being related to most of them

If I select a Brand menu item that does seem to (sort of) behave, the brand clicked stays highlighted and those brand products are shown on a page. HOWEVER, as with the issue above, when you select one of those brand items, the menu clears, so you cannot tell what brand you had selected.

Can anyone help with this at all, I am happy to be told that I've set this up wrong if I have, but my developer suggested that the nodes are not being written correctly in the menu process.

SmithCart adds a class to the selected category in the category list: .SelectedNodeStyle
The problem is that wherever I click in the category list, the class remains allocated to a specific list item (Blue shoes e.g.).
This is a coding error in their opinion.

I would really like to resolve this, Any help or suggestions greatly appreciated.
Rob.

Re your reply.

Did you import your product data?
/* I did import the data */

If so did the issue exist before importing your data? 
/* Until I imported the data I did not know this issue was happening */

Are you using the category "URL Keywords" field? If so try deleting the data in this field and check to see if the correct Category is highlighted.

/* I had descriptive content in the category keyword URL field, I deleted this at your suggestion, and the system SORT OF works.
If I remove the content of the Keyword URL field then it 'remembers' the category clicked on the menu.

UNFORTUNATELY I then see a URL of www.mysite.com/product-catalogue/categoryid/7 
INSTEAD OF www.mysite.com/product-catalogue/categoryid/my-nice-descriptive-category-name.

This is a fault, Why bother adding this functionality if it breaks the menu? 

As a test I added the keyword URL back on one of the categories, and it breaks the menu. When you click that menu item ALL the sub categories under ALL categories in the menu then expand, and a menu item that was NOT clicked on highlights. this is wrong. If I add the Keyword URL back on all cats/subcats, clicking on any of them ALWAYS causes the SAME menu subcategory to appear highlighted.*/

Regarding highlighting the Category on the Product Details page, the Category module currently only supports highlighting the selected Category on the Product Listing page, not on the Product Details page.

/* I would have expected this as a standard function , why select a category, then a product in that category and then have no way of telling which category you are in, except by either looking at the URL, but wait, you have to remove the keywords in the URL because they break the menu if they are there. */

I have now raised a paid for support issue. I await responses from those.
Regards Rob.