The Jewish Pesach Passover date of Nisan 14 is on Monday 22 April 2024, so why are Jehovah's Witnesses holding their Memorial on Sunday 24 Mar 2024?

Normally, the Memorial service for Jehovah's Witnesses is based on the Jewish calendar for Nisan 14. My understanding is that Nisan 14 is always the first full moon after the Spring (or Vernal) equinox, which happened on Wednesday 20 March 2024. This year, 2024, Nisan 14 falls on April 22 when there is a full moon. But the Memorial service is going to be on Sunday March 24 this year. ***Could this discrepancy have anything to do with fact that 2024 is a Jewish leap year?*** NOTE: According to a Jewish web site I found, there are 13 months in the Jewish calendar. The first month (Aviv/Nisan) in 2024 starts on Monday April 8 but to link to our calendar, we need to start with Shevat on January 10th, 2024. Shevat: January 10 - 11th month in Jewish calendar Adar 1: February 9 -12th month in Jewish calendar Adar 2: March 10 - 13th month in Jewish calendar - full moon 25 March Aviv/Nisan April 8 - 1st month in Jewish calendar - full moon 22 April