Hi Rashida.
Duplication of the template style can be too cumbersome in the aspect of further administration of the site.
This is an old problem in Helix, which occurs with some third -party modules. But I think the reason is that in Helix something is missing and this should be corrected.
And duplication of the template style may not help at all. For example, in the case of the online store (like Joomshopping), when in the category of goods you have a module in Sidebar, but in a separate product it is not, but Sidebar remains. I have to solve this problem through JS and CSS, since the assign of the separate template style for the product is not possible at all.
Please transfer this problem to the developer team. Although I have a very weak hope that this will be fixed. :(