Wrong letter(s) appearing in root

[donaldsoncd]

I looked up the string "yu'mnun" which I think should be related to this root, but it is spitting back something that doesn't seem to possibly be right since it includes the Arabic letter r (ر) instead of n (ن).

(PS - It's an amazing tool for my research workflow since I am not a specialist of Arabic but am dealing with it in relation to the African language (Manding) that I work on -- thank you so much!)