DRDO Multi tasking staff Model paper 7

Consider the English alphabetical series for the numerical value of letters.
B CD E F G H I JK L M Positional value 12345 6 7 8 9 10 11 12 13 Positional value 26 25 2423 2221 2019 18 17 16 15 14 Alphabets Z Y X W V U T S R Q P O N
The followed pattern is:

Clearly, in place of M, there should be L.