Extra white bar on keyboard in some devices

[gtandanny]

When installing on some devices listed below, an extra white bar appears between the default keyboard and the extended one.

Samsung Galaxy Tab E 9.6 (T-560) Android 4.4.4 https://imgur.com/ott7Q7n

Samsung Galaxy Core Prime (SM-G361H) Android 5.1.1 https://imgur.com/PKzO1c3

Android Simulator 10.1 Tablet API 28 https://imgur.com/Yd5ps9D