Since (unknown update), the gesture mode swipe down to hide does not work in 99% of the tries. The keyboard tries to do anything, but hiding, types the first key the finger touches the moment it hits the display, without even starting a gesture recognition, or does whatever.
Please fix this, it's really annoying, because the damn keyboard has no close/hide button. There are thousand of forms which does not trigger a close button, for example when you want to write a rating on the Play Store, and the damn SwiftKey is in the foreground, over the input test field.
Asked a friend to try, and for him it's broken too.