ebook reader

I'm going through some of the graded readers from Rainbow Bridge that Pleco has to offer. Browsing through the first sample, however, already shows a strange piece of text (shown in the image). While the story is intriguing, I'm not sure whether I'm willing to buy it if this continues...

Hi, I purchased the Chinese History ebook through Pleco and it is great. I have some Mandarin study PDFs that I would like to be able to read through the Pleco Ebook Reader as well but can't figure out where to put them so the Ebook Reader can access them. At the moment when I select the Ebook...