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.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2942205:01crwdne2942205:0:

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?

Adding images to an existing question

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0