Bad glitch when editing a contact! – Highrise - Simple CRM Review

Do not try to "edit" a phone number in this app unless you have the entire phone number in hand! One of our staff accidentally typed in one extra digit in a clients contact. So, in the app, I tried to call the client and sure enough, the call didn't go thru because there was too many digits. So, I click "edit" to delete the one extra digit, except when I hit backspace, it deleted the entire number! What's worse, I realized his and purposely avoided clicking "save" so it wouldn't save the error. Instead I clicked "cancel" which should have prevented any of my changes to be saved, but it didn't. It permanently deleted the phone number ! Wow. Who would know I would lose a clients info so quickly. First, I don't think he backspace should delete the whole number. Editing is exactly that, to edit, not erase and rewrite especially on the go(hence app functionality). Second, if it does delete it completely, shouldn't the "cancel" option avoid the delete from being permanent?
Review by editing problem! on Highrise - Simple CRM.