“From the blog” message on all my pages

Hi there! Could someone help me please? I have just realized that on my site (gaborvaszkun.com) all my pages shows only "From the blog" message not the page content itself. Until a couple of weeks ago it worked fine. I haven't changed anything but it still broke somehow. As far as I could go on with solving the problem I was told that the Theme of the site can cause this. Can anybody help me please?