Mask input field changes value

I have an input field with a mask '(999)999-9999' that is pre filled when page is displayed. When the field has focus, user tabs into it or clicks it with the mouse, the values change. Example: On page load the prefille field looks like this. 31547233721 When focus is placed on the field it changes to this. (154)273-1___ Thoughts? Had this happen before and the only way I can get around it is to remove the mask.    
1 answers

Hi Brian, the input mask is limited to 10 digits, while the value 31547233721 consists of 11 digits.

Try changing the input mask, or update the value. Let me know if this helps.