Hamilton pay station Keypad Malfunction

[water guy]

When a customer pushes a $12 wash it gives them a $6 wash no matter what has anybody else heard of this seems I've had this problem years back can't remember what it quite was.

 

[Randy]

When a customer pushes a $12 wash it gives them a $6 wash no matter what has anybody else heard of this seems I've had this problem years back can't remember what it quite was.

Which Hamilton pay station?