SWIFT and DTMF

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I have these lines in a dial plan:

exten => s,n,Swift(Enter ID number,5000,5)
exten => s,n,NoOp(Swift_DTMF=${SWIFT_DTMF})

When the user presses 12345 the SWIFT_DTMF is 52345, it doesn't matter what they enter it always replaces the first digit with the last one, any ideas what might be causing this...