Every time I use the scratch pad the writing disappears halfway through on my iPad and I have to restart answering the flashcard. Im using my iPad and a apple pen for this
I think this may be an iOS bug. If you update to the latest iOS version, does it persist?
Please also note that the scratchpad was originally intended for practicing the writing of non-English characters. If you’re writing large amounts of text there, you may want to consider trying to make your cards test less at once: Effective learning: Twenty rules of formulating knowledge - SuperMemo