Photostream on iPad mini contains only the last 102 photos
All of a sudden, on my iPad mini I can see only the last 102 photos in my photostream, whereas on my other iDevices I can see all 1000 of them. Whenever I take a new picture it does appear in the iPad mini photostream but I can't see the older photos anymore. What happened and how can I get all the photos back?
iPad mini Wi-Fi, iOS 7.0.6