I’m using the Genesis theme, and have the same problem. When Default Page Template is selected, the #sidebar is put inside the #content div for some reason, it seems to be missing a closing div. So my quick fix was adding the < / div > end tag in the text box that says “Add HTML after event content” (in text view) under Display Settings. Worked for me. Maybe not for everyone, but puts the sidebar in the correct place when using Genesis and the Default Page Template setting