Why does it say try again when I try to enter password on settings to change my password

I'm using a android smartphone (samsung galaxy j1 ace). I went to settings and typed in my current password and it said try again. Then I typed slower and makeep sure the password was correct and it still says try again. I tried many times with the correct password and it still says try again. So now I cannot change my password. I'm running android lollipop 5.1.1

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