My Calculator's [AC] & [-] buttons aren't working properly

I cannot turn it off, or reset it because my AC button doesn't budge. Meanwhile the minus button adds a number 1 in the equation whenever I press it. Please help! I really need this calculator. edit: my division button also adds 4 instead of the division sign.

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From what you are describing is sounds like the buttons have been mirrored . Could you add a picture of it so i can confirm this?

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