> There's a reason why there's a plethora of transcriptions of "مُحمّد" after all.
There's a plethora of transcriptions into (more) phonetic alphabets because there are a plethora of regionalized pronunciations [1]. And there are a plethora of pronunciations because Arabic uses an impure abjad [2]. Since the vowels are not always, exactly or uniformly specified in writing, unspecified behavior leads to varying results in each compiler.