Don't know why Sidebar has moved underneath the blog content

– generally this happens when you have an open div tag.
– you have 166 markup errors.
– See the markup validation output report

there seems to be some problem with your latest post ‘A “Man-Made” Suit is the Way to Dress!‘;

look through the post’s content, using the ‘text‘ setting of the editor, and check for a missing </div>; if in doubt, try adding one </div> at the very end of the content (only in that one post).

also, double check the code of your site; there are many errors – https://validator.w3.org/check?uri=http%3A%2F%2Fiamactionjackson.com%2F&charset=%28detect+automatically%29&doctype=Inline&group=0

https://codex.www.ads-software.com/Validating_a_Website