Hello Samir,
While viewing your site, we found some errors on your site, which is arising due to some changes on codes. I think while creating child theme, some mistake is happened there. Would you please make sure that the child theme is really working fine? Did you notice, footer on the page is also missing? So, please make sure that the child theme is working properly. Try once by activating parent theme once and view that page, is sidebar will activated or not.
Thanks