Blog Post Sidebar Issue

Until the latest update, my right sidebar on my blog has been, well, where a right sidebar should be. Ever since the update, however, my sidebar is showing up below the blog posts, which does nothing for navigation like it’s supposed to. My question is both a question of why it suddenly moved (nothing was changed in wordpress, and upon a check, everything is as it should be from the backend) and how to return it to its glorified position on the right (where all the backend tools are telling me it currently should be)? If this is not a clear question, or further information is required, let me know and I’ll do my best to explain more accurately.

Many thanks ahead of time.