Letters that cannot be clicked

[Dufftempest]

After copying and pasting using (Ctrl+c) or selecting a word using (hold shift+arrow) I often experience letters on the keyboard that cannot be clicked, such as: "a, s, x, c, v, m" this happens in both versions: the latest version on the Play Store and v.5.0.3
Hopefully there will be a continuation of this project, this keyboard is simple, easy to use and doesn't require too many settings.
Thankyou very much.