Hey Garima, It happens if your net is slow or you closed the app or site before complete upload. Try to upload 5-10 pictures and then add more after clicking the option 'Edit' on your blog.
Hey Garima, Yesss, it happens with me also .. better is to divide your photo blog as part 1 and 2 and so on... And then go on adding not more than 5 pictures per photo blog ... So that you will also get a lot space to write a out each photo and then extra photo blogs too.... Happy Travelling!!!