Weird %MINIFYHTML code showing just before </body> tag

The following code is showing on certain pages of my wordpress site.

%MINIFYHTMLba8fd15a026c51b9ab71a637e3fe71401%%MINIFYHTMLba8fd15a026c51b9ab71a637e3fe71402%%MINIFYHTMLba8fd15a026c51b9ab71a637e3fe71403%%MINIFYHTMLba8fd15a026c51b9ab71a637e3fe71404%

I am using Thesis 2.0 and wordpress 3.5

I can’t google the error properly because of the % sign.

I have disabled cloudflare performance, and w3 total cache, so there should be no caching or minifying going on.