The Maharam Shick (Mitzva 605) writes, In a year where the upcoming year will be a
Shono Meuberes (leap year- like this year) The Chasam Sofer had in mind to be yotze
the Mitzvah of Zechiras Mechiyas Amalek , when they leined the Parshas Hashavua
of Ki Seitzei.
His reason was, according to the Gemoro people forget after 12 months.
Therefore we have Parshas Zachor once a year, not to be Oiver the Lav of
“Lo Tishkach”. So as not to have from one Parshas Zachor to the following one,
more than 12 months, he made sure (in a leap year) to have Kavana to be yotze
the Mitzva at the Keriah of the Parshas Hashavua and again on Parshas Zachor.
It is interesting, in the Teshuvos (E.H. 1: 119) The Chasam Sofer writes that
in a leap year the memory does last for 13 months instead of 12.