iOS Kindle update was deleting books, should be fixed now
Amazon pushed an update to the iOS Kindle app, and quickly found a known issue with the update, which caused books to be deleted. Amazon then submitted a fix to the App Store yesterday, but the fix wasn't approved by Apple until after Amazon released a statement warning users about the update, and news stories began circulating about the issue.
The fix is said to be live in the App Store now, so users shouldn't have to worry, but it seems like something could be done to speed up Apple's approval process for important bug fixes like this.
source: The Next Web