category not displaying the product list related

Hi,

i think i remove something that i shouldn't.

on my left side website i have a module that display all categories of products.
when i click on a category, a products list should be displayed on the content div of my website, however nothing appears.

before that i removed several not published parts that were in Display > Content Module.
i guess that's the problem.

Therefore i tried to create new content module for each category but still not successful even if i attach them to category via "Associated category" set to category related and "Synchronize with currently
displayed item when possible" set to "yes"

so what did i miss ?
thx