AS A DC9-30 PARKS AT ASSIGNED GATE AT GFK; ND; THE CHOCKS ARE NOT PLACED PROPERLY AND THE ACFT ROLLS FORWARD AND STRIKES A TUG.

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WE ARRIVED AT GFK; ND; AND PARKED AT GATE; FACING W. I RECEIVED THE 'CHOCKS IN' SIGNAL AND RELEASED THE BRAKES. THE JETWAY MOVED INTO POS. I THEN NOTICED MOVEMENT OF THE JETWAY. I ASSUMED THE JETWAY WAS MOVING AND TURNED MY HEAD AWAY. IT WAS DARK OUTSIDE; SO I DIDN'T NOTICE THE ACFT MOVING. WHEN I LOOKED TOWARDS THE JETWAY AGAIN; I THOUGHT WE WERE MOVING. I THEN REAPPLIED THE BRAKES. THE R VORTEX FENCE ON THE WING WAS STRUCK ON THE BOTTOM BY THE BAGGAGE TUG STEERING WHEEL. THE DRIVER OF THE TUG SAID HE HAD PLACED THE CHOCKS IN. HE THEN ATTEMPTED TO RECHOCK THE WHEELS 2 MORE TIMES BEFORE WE STOPPED. THE PERSON WHO HAD GIVEN ME THE CHOCKS IN SIGNAL HAD GONE; SO HE COULDN'T LET ME KNOW THE ACFT WAS MOVING. THE JETWAY OPERATOR PULLED BACK WHEN HE SAW THE PLANE WAS MOVING. IF THE RAMP SLOPES THAT MUCH; MAYBE THE PAGE FOR THE ARPT SHOULD SAY SOMETHING ABOUT LEAVING THE BRAKES SET. SUPPLEMENTAL INFO FROM ACN 376712: THE GND SVC EMPLOYEE STATED CHOCKS WERE INSTALLED AT AN ANGLE AND DIDN'T HOLD. THE MARSHALLER NEVER SIGNALED US THAT THE ACFT STARTED TO MOVE AGAIN. WE DID NOT NOTICE AS THE JETWAY WAS FORWARD OF THE ACFT AND THE AGENT WAS MOVING IT TOWARD US; WHICH NORMALLY GIVES THE ILLUSION OF ACFT MOVEMENT. THE RAMP WAS DARK AT THIS SMALL OUT STATION ARPT SO WE DIDN'T RECOGNIZE MOVEMENT EITHER. FROM NOW ON AS A FO; WHEN THE JET BRIDGE IS POSITIONING AND GIVES THE ILLUSION OF ACFT MOVEMENT; I WILL STEP ON THE BRAKES JUST TO MAKE SURE IT IS ONLY AN ILLUSION AND NOT ACFT MOVEMENT.