Silly Bug in Microsoft Windows Calculator ? 2-2 != 0 ?

Step 1 : Open Windows Calculator.

Step 2 : Press the number 4 and apply Square root which gives result 2.

Step 3 : Now subtract 2 from the answer ie, 2-2 and press equals [=]

Shocking bug right ?

I learned that 2 – 2 = 0 but windows calculator has some different suggestion.