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Water Spray from 1 radiator

New to steam system. One pipe steam system. New Boiler, original pipes and radiators. 2nd floor radiator, seems to be last on line gets loud knocking/hammering, can hear steam coming, then a shot of water, then steam. element heats well. replaces vents twice, the larger the vent, the more water is released. Could this be a problem with the water getting blocked from returning in this specific line? No issues with any other radiator, 7 in total in the house. Where should I start before going into walls, floors, ceilings. Renovated house, just purchased. Thanks in advance.