Unexpected texts shown without my knowledge in the theme

Hi all,
I was really surprised when I see unexpected texts appear between the comment box and the footer. Click here to see the screenshot. Here is the incident link.

According to my investigation, only one post is infected. I was hosting with dreamhost past years and I just moved to new host yesterday and found out that one.
More surprisingly, Safari and Firefox showed the same but there is no such thing in Chrome. All browsers are in Mac.
I have no idea how this thing could happen.
Please share your idea and suggestion to stop that thing.

Thanks in advance!

Update : After this post, I refreshed the page and it disappeared again. I’m feeling I’m hacked!