Pronunciation of "signora" - [o], [o̞] or [ɔ]

Word Reference, Wiktionary and dipi say that "signora" is pronounced [siɲˈɲora] (Standard Italian), but I hear [ɔ] instead of [o] in the audios in the first two references. It doesn’t sound at all the [o] I hear in https://en.wikipedia.org/wiki/IPA_vowel_chart_with_audio (and the Italian vowel trapezoid in https://en.wikipedia.org/wiki/Italian_phonology#Vowels confirms that Italian’s /o/ is pronounced in the same height of [o]). The only place where I found the standard pronunciation was in Google Translate. Am I mishearing the word or is there some inconsistency between the audio files and the corresponding IPA transcriptions which are not covered by these dictionaries?