Sidebar at bottom

Hey, I am having an issue with my blog https://www.theherbalremedy.net. On the front page everything is 100%, as soon as you go to any post the sidebar is at the bottom of the page. I did do a search but couldnt find anything of value.

eg page: https://www.theherbalremedy.net/herbal-remedy/valerian-herb-natures-tranquilizer/

If anyone could help me I would really appreciate it.

I am not sure when it happened or when the last good config was.

Regards,
Byron

P.S: I have also run it through the validation but no errors were found.