I know I checked it with caecilia and palatino with no issues. I'd delete the book and see if there's an updated version available before re-downloading. If that doesn't fix it, I'd delete the cache/user data for the Kindle app and uninstall, reinstall, reregister. The ability to change fonts is a fairly recent feature for the Android Kindle app. Perhaps there's remnants of old versions lurking/griping on your device.
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