You're probably using an old bookmark, if so delete it, do what Bri and Disco have said, then re-bookmark it.
I'm no good with Kindle's so wouldn't have known where to start with that. Glad you got to the bottom of it fella.
I don't understand kindles. It's like an extra item for the sake of it. I say this having an iPhone, PC, laptop l, Mac and iPad like.... ha
Ha ha thats why I am on rooch 3 i lost 1 and 2 and nearly lost 3 last week and remembered my pass word it usually says I can't have rooch 1 or 2 as somebody already has them , yes its me you daft twat.
