I don't have the Kindle app on my Galaxy Tab A but I do have it on my Galaxy phone. I installed the version that allows use of the SD card a couple of weeks ago, I think. I didn't really look into it. I just installed it and forgot it.
I just now checked and it says in settings that it puts books you've downloaded AFTER you install it on the SD card. Presumably that means those installed before were in main storage. I can't test that because my habit is to keep only my current book on my phone and I've begun another book since then. So I don't have any books that were downloaded before the new version of the app was installed.
You might try removing your books and downloading them again to see if that makes a difference, assuming you don't have too many for that to be convenient.
Barry
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