ALS G1313A Leak

Hi,

Working on a G1313A ALS Had a leak at needle seat when in mainpass. Changed needle, needle seat and needle loop. It has stopped leaking but if I do maintenance diagnostic and it comes to the last step where it lifts out the syringe from the needle seat. Liquid flows out of the tip of the needle and then you hear the valve clicking and it stops.

What would cause this?

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