I am creating a fillable document with Acrobat pro. I've created a text field formatted as number with no decimal places, separator style with comas, limited the number of digits to 18. when I type in all 9; when I tab to the next field, I get 1,000,

I am creating a fillable document with Acrobat pro. I've created a text field formatted as number with no decimal places, separator style with comas, limited the number of digits to 18. when I type in all 9; when I tab to the next field, I get 1,000,000,000,000,000,000; when I type all 8 and tab to the next field, I get 888,888,888,888,830. If I type all 7 and tab ahead, I get 777,777,777,777,777,790, etc. How can I get these numbers to stay as they were typed?