Hello Lisa,
by default, PubReader opens the content at the very same page that was seen on the reader. This perfectly makes sense for a book.
If you want it to open always on the first page (regardless of what page the user was seeing last time it opened the project), you can use the Opening Page project option, which was just introduced in the 3.1 release. BTW, to see it working, you have to wait some more days, since the new version of PubReader with support for that functionality (1.3) is currently under review by Apple.