The first and last digits of the answer are sometimes partially (25%) hidden.
I use Handwriting Calculator version v.1.0 on a Nokia 5800 XM, SW version 21.0.025.273.03, language set 3.
To reproduce, enter 2^23 (twenty-third power of two). It has a result starting and ending with "8".
The severity of the error seems to be increase with the number of digits displayed in a smaller font in the left-hand expression, as well as to the number of digits in the result.