The Store bug has now dissappeard on my iPad Air but there is another bug which seems to be associated with 9.3.3 update.
When closing iBooks with an HTML widget open, (for example an animation) it will resize to a smaller size when you open iBooks again. And again even smaller if you continue to close/open iBooks.
You need to close the Widget and reopen it to get back to fullscreen size.
I have 9.2.2 on my iPhone and it works correct with the same iBooks.
I also have an old iPad3 with 8.6 which does not have this problem.
iPad Air Wi-Fi, Cellular, iOS 9.3.3, null
