Note that your Template Monster template may have modified standard behavior so that tutorial instructions will not work for your store. There is already custom coding affecting your specials listing page.
The Column Layout Grid mod affects only the product listing page, not specials or featured, etc.
Your product listing page is already in grid layout from your template, so there is no point in adding the Column Grid mod.
Your home page is showing the featured products centerbox, which normally displays in grid form. There is no obvious evidence of code changes there, but it is hard to be sure it is stock.
What do you have for Configuration > Index Listing > Featured Products Columns per Row ?