Ali Korani is one of the leading shia scholar of our time, he said:
“As for the point of view regarding tampering in Quran, some shia scholars say: Tamper occurred in Quran, it means (yanee) some verses seized from it. Say that: Some verses were taken from their (real) place and put into the others. As for saying that places of verses have been changed, this is a saying of majority of shia scholars. If we could say with more clearness: Here (Qum?) there are few shia scholars, they say: Some verses from Quran are missing”.
You can listen to his voice, and load file from this link