When I studied "Language & Culture", particularly "Accents & Dialects" I learnt a lesson that pronunciation is a debatable/arguable/questionable point because different people, even in one country, have different opinions. For instance, in the UK, I heard different pronunciations for OFTEN e.g.:(Oftin, Offin, Aufin, Auftin) and maybe there are more, so, please do NOT bother your head with this particular pronunciation. There is no absolute answer for this.
I'll provide you with another example: the word LETTER is pronounced in east London (LA?A) which means there's no /t/ sound, but in south London they pronoune it (LATA).
Have you heard Newzealand accent? Please listen to different accents & dialects to avoid ambiguity and obscurity of Pronunciation. I hope that hlps.