Melodyne Question - Timing Off

I bounced my lead vocal out of ProTools (24/44.1 Wave file).



Opened in Melodyne Editor stand alone, did the tuning and saved as .Wav.



I import back into Pro Tools, but for some reason the timing drifts and is way off.



I didn't do any timing correction at all in Melodyne-- just pitch.



The recording was not done to a grid and the tempo in ProTools was the stock 120.



I went back into Melodyne and set the tempo to 120, but it is still way off. I also unselected 'Active Grid' and 'Dynamic'.



Any ideas? Thanks!