the default fitting method is not mpfit

in fityk 1.3.1 (windows), everytime I start I see in menu/Fit/Method: selected is "Lev-Mar (own)", contradicting the doc at https://fityk.nieto.pl/fit.html#levenberg-marquardt :

Two implementation of this method are available: one from the MPFIT library, based on the old good MINPACK code (default method since ver. 1.3.0), and a custom implementation (default method in earlier fityk versions).