USB Keyboard Issue in Set Top Box Android Kitkat 4.4

I have a set top box Android Kitkat Version 4.4. I use USB Keyboard in my set top box, when I press Shift+Any Key (example Shift+A or etc) on EditText, mouse pointer change the icon.
When I want to delete any words, I cant delete the word using Backspace. Maybe Shift Key was locked. I can delete any words when I close the virtual keyboard and then open the virtual keyboard again using USB Keyboard.

Pointer Before Press Shift in USB Keyboard
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USB Keyboard Issue in Set Top Box Android Kitkat 4.4

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