This is often due to a modifying expression, such as a prepositional phrase, the application of which is unclear.
ðɪs ɪz ˈɔfən dˈuː tʊ ɐ mˈɑːdᵻfˌaɪɪŋ ɛkspɹˈɛʃən, sˈʌtʃ ɐz ɐ pɹˌɛpəzˈɪʃənəl fɹˈeɪz, ðɪ ˌæplɪkˈeɪʃən ʌvwˈɪtʃ ɪz ʌŋklˈɪɹ.