My Site Has Mysteriously Changed To All Bold Fonts

All of my blog posts — with the exception of the the last one posted on 3/25) are now in BOLD.

Go Daddy claims my site has not been hacked.

My site is hdslrnow.com.

After this occured, I updated to the latest version of the 20/10 WP Theme. I only use a few plug in, but have not updated them.

Any help would be appreciated on how to get those posts back to non bold font.

Many Thanks!