Dialog Library: Input Dialog accepting only numbers

I tried the Dialog Library. All dialogs work as expected, but the Input Dialog, for some reason, only accepts numbers. When I invoke the Input Dialog, the Swiftkey soft keyboard pops up, already with the numbers tab open, and I can only type digits then. When I switch to letters and type them, none gets accepted by the Dialog. I can switch back to digits and enter them.

?

Thank you.

Regards,