Lightroom Mobile (iPad) is wasting my memory space

Everytime I add RAW files to Lightroom mobile and delete the original files after editing them, Lightroom is using more and more space on my iPad. I have cleared the cache, I have deleted all files in the cloud and I have removed all files permanently from my deleted objects folder within Lightroom. But anyway: each time I add and later delete new files, the memory consumption of Lightroom is increasing. I can see it under the memory space info in the iOS settings. Where are all these files which are using so much of my iPad memory? I do not want to delete and reinstall Lightroom to get more free Memory Space (which works fine of course, but deletes all my Lightroom settings)?

I am using the newest version of Lightroom for iOS (6.2.1)