Wrong symbol appears in urdu-to-hindi transliteration

[kfmn]

I used your software (via python wrapper) to transliterate some Urdu words into equivalent Hindi written form.
And I have found that the wrong symbol "M" (latin M letter) appears during processing of several words, for instance
اورانجنیرنگ
اور ْا ِن ْج ِن ِیر ِن ْگ ْ
ہو.ننگا
which were converted into
औरइMज िन ीयर ि ंग
औरइMज िन ीयर ि ंग
ह ो ंMग ा
respectively.