lcd display repeats the same digit twice

hi i am using at89c51 controller along with jhd162a while printing the number like 1234
it prints as 1133,this error does not happens always, only few times it prints correctly as 1234 ,but most of the time it prints with error as like 1133,even i ve changed the circuit board still it prints with the same error
please guide me to solve the problem
thanks in advance

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