Mobile field using Alias

Mobile field using Alias

Hello,

In my form public link i am using alias with the "Mobile field". 

It works fine but the phone number appears with dashes (see screenshot)
The mobile field in the Zoho campaign does not appear with dashes (see screenshot)
The user cannot move on to the next question without deleting the dashes (see screenshot) "Numbers only"

How can i fix it?

Thanks