I've been having this problem with a number of ebooks on my PRS-T1, from a variety of sources - in fact, it's rare that I get through a book without this problem cropping up at least once.
I've found that if I go back a page, change the font size, and then change it back again, when I go forward I will then get the correct text. I just had it happen now, and I actually unzipped & opened the epub file in a text editor on my computer at looked at the relevant section and could find nothing out of the ordinary in the text or formatting.
This, plus the fact that others describe fixing the problem by closing and reopening the book, would suggest that the problem is not with the formatting of the epub itself - if it were, surely the "skip" would recur every time you opened the book at that point. Frankly, my experience with the PRS-T1 has been one of quite buggy firmware from the outset, and I can't say I have much faith that this issue is one that will be resolved.
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