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Maidstone returned to the top of Ryman League Division 1 South with two late goals in a 3-1 win at home to Three Bridges.
United played poorly in the first half and trailed to Tim Rivers' 34th-minute strike.
Stones defender Nicky Humphrey equalised just before the hour, then Paul Booth (pictured) came off the bench to put Maidstone 2-1 up with five minutes left.
On-loan winger Warren Whitely made sure of the points by adding a third in the last minute.
Margate stretched their lead at the top of the Ryman League Premier Division to four points.
A goal in either half from midfielder Mark Corneille and a third from Matt Bodkin secured a 3-1 win over Carshalton at Hartsdown Park.