You must be pressing the wrong button!
Are you certain that you have pressed the square button and not just multiplied by 2?
Try typing in -2 * -2 and see what result you get.
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2
Because it thinks that the negative sign is actually another operation to do and because of the order of operations, the calculator squares it first then makes it negative. To fix it, type it in like this (-3)2
12
The square roots of 4 are -2 and 2.
-2