I see. To be fair, the Sunni also have differences regarding the Qur'an. The Maliki use the Warsh version, which the remaining Sunni use the Hafs version. While the differences are minor, only regarding a few vowels and consonants here and there, they do exist. I just recalled, the Shi'a view within a few is based on a controversial hadith by Hazrath Aisha about a goat eating a leaf on which one of the last suras was written a few days after the prophet's (SAW) death. I can't recall the hadith, as far as I know, the Shi'a have most definitely rejected all of Hazrath Aisha's hadiths. There's also another source, plus Uthman's burning of non-standardized Qur'ans (one of these was discovered in 1974, the scrolls of San'a, it is the oldest Qur'an discovered till date). However, yes, most Shi'a refute this allegation that they believe the Qur'an is corrupt or incomplete, simply based on the view that the other Sahaba had no qualms about Uthman's compilation. On the other hand, Ali's compilation was controversial.