Formatting disappears on front page

All formatting disappears on my front page – my post is there but without spacing, horizontal lines, links, etc. Here is the front page: https://www.thelivedlife.com

The actual post itself is displaying correctly if I click on it via Recent Posts – see https://www.thelivedlife.com/archives/69

The same problem occurs when I go to the post via Categories or Archives – see https://www.thelivedlife.com/archives/category/uncategorized and https://www.thelivedlife.com/archives/date/2014/06

I’ve noticed that if I switch to a different theme the problem disappears and the post reads correctly on all areas of my site. I would prefer to keep SERENE as my theme so any help would be greatly appreciated

As a disclaimer – I’m very new at this and don’t know how to code

Thanks