BUG in the calculator!

I know this is really like.. erm.. something which most people won't bother about. But I have found a bug in the sharp calculator (not literally).

Use mode 2,  2 to solve the following equations using a SHARP calculator.

x^2 - 4x + 4  = 0

x^2 - 4x + 5 = 0

If the answers for both equations are x=2 as given by your calculator, your calculator has the bug! Because x^2 -4x + 5 is CLEARLY not the square of (x-2).

This bug affects other perfect squares as well.

eg. x^2 - 6x + 9=0  AND x^2 - 6x + 10=0  both yield x = 3 as the answer.

To avoid falling for this flaw, try using cross factorisation first before you use mode 2, 2.