Just because they are doing reshoots/pickups doesn’t mean anything is “wrong”. Reshoots are a normal part of the production process and are to be expected.
As announced by The Twilight Sage Facebook page in a letter written to the fans from director Bill Condon:
A film is a lot like a puzzle, with each piece - each shot, no matter how brief - needing to fit exactly with the ones around it. Our Part Two puzzle is finally coming into full view, and in a few weeks we'll be heading back north to pick up some additional shots - the last tiny missing pieces. We're not shooting any new scenes or dialogue, just some technical work with some of our cast and stunt actors.
I am really looking forward to being back on set with some of the friends I've made on my Twilight journey, like the great Guillermo Navarro, our cinematographer, and his crew. And yes, Rob and Kristen will be there too, to pop in those gold contacts one last time...
Read the full letter here