This kind of problem not happen when:
- Not touch into input (HTML textbox), my function fire with all key
- If I touch into textbox, the function only work again if I focus in browser address url, then focus in back the content of browser
- When I use swiftkey, not happen with Gboard, physical keyboard
- In Google Chrome Android browser v68.0.3440.91, I hanven't try another browser yet
So I wonder if your swiftkey software is preventing user press character, number after focus out an input.