Walking into the masjid, you hear your Imam reciting Surah Al-Fatiha... But it is being recited differently from the way you are used to hearing this surah being recited... Is your Imam making a mistake? Are there other ways that are correct to recite Surah Al-Fatiha?
The Qur'an has variant recitations. If certain vowels in a surah sound different, then perhaps the Imam is merely reciting it in one of the variant recitations. But if whole letters and words are changed, then there may be a problem.
Shaykh Mohammed Mana explains and answers in this video
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