lack of scrolling for some downloaded epub

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I'm sure I am just missing something, but for some reason in certain downloads via Calibre (Economic Times of India) I cannot scroll to obtain the second half of an article being read; by use of the stylus or the next button the screen just goes to the end of the article. This doesn't happen with the Washington Post or The Guardian. Interestingly, the TOC with article titles scrolls just fine with the next button. I tried also converting the epub to PDF to see if that would work - unfortunately, it did not. I tried searching on the Calibre forum, but no one else seems to have that problem (which again makes me think I am just missing something simple). Any suggestions are highly appreciated...TIA.