The best way to explain this is to put his in classic Seinfeld terms: Chris Christie knew how to issue executive orders, he just didn’t know how to end them.
Gov. Phil Murphy today terminated seventeen weather-related executive orders issued by Christie between 2010 and 2017.
“The severity of the conditions necessitating the declaration of a State of Emergency has eased,” Murphy declared in terminated yesterday’s snow storm emergency today.
Christie’s executive orders were legally still in effect until Murphy took action today.

Chris Christie. Photo by Kevin Sanders for New Jersey Globe
Murphy terminates 17 Christie executive orders
Weather-related state of emergencies never ended by former governor
By David Wildstein, March 04 2019 10:46 pm