We have a form with a number field that we've given de "number" apprearance to get a numpad keyboard in the Survey123-app. Entering a value seems to go fine. However, if we try to submit the result of the form we get the following message: (which means "the field "afgelezen peilwaarde" is required")

If we enter a number through our default Apple iOS keyboard it submits just fine. It seems the numpad keyboard in the app isn't registering correctly.
Is this a known bug?
We are using iPad Air 2's with iOS 10.2 and version 1.10.25 of the app.