New Input Appends Last Result

[helmanfrow]

New input is expected to clear the results of the last calculation but instead appends the last result.

For example, I want to calculate 99 and then 55. I type 99 and get 81. I start typing 55 expecting 81 to disappear as I begin typing but it remains so my calculation is entered as 815*5.

I must manually clear the display buffer before entering a subsequent calculation.

This behavior is at odds with typical calculator behavior.