Right Side Bar issues

Hi, I’m having a similar issue, I want my content to run across the available space within the border, but it rather stops right before widget space, initially only my homepage had this problem, but me trying to work it out affected the rest of my pages, and I don’t want it like that, please tell me what to do

The page I need help with:
https://www.jstore.net.ng
and almost every of my page

The page I need help with: [log in to see the link]