I noticed the right sidebar was smaller, which it looks like you did it correctly. I saw that and I was like, wait, that’s small, then noticed you did span2.
But as for your right sidebar floating left, again, does it go back with a post in your blog?
I also agree, it would be awesome if that ability to select a blog layout to adopt from the page template selection, as well, having that noted in the Codex is not easily found but it’s found on the Static Front page codex page that says:
By the way, you do know the Preference theme has the same option to use a right or left sidebar layout for the blog? If not, go to your theme page and click on Customize, or go to the main dashboard home, click on Customize Your Site button. Then on the Basic Settings tab, you will find your option for this. If you need something different that isn’t in the theme, then it means coding a new custom layout.
Debugging is generally done from the config file in WordPress which you have to change from False to True.