Hi,
StyleMart is using "browse cache" to store the "View" selection to increase the user experience (so once you choose ListView for one category, you keep seeing ListView for other categories as well).
For instance; if you hide the buttons after making your selection, you will end-up with blank category, because you picked "i.e: ListView" and your browser is trying to gather the ListView (but it is not exist anymore).
So, the best way is to "clear your browser history -- including cache, cookies etc --" then then make your edits through backend. Then you shouldn't end up with blank-category.
Regards.