Problem Processing Effects on Vocals

Hello There!

I hope you’re all doing well and staying safe and healthy during this time!

So, for a cool vocal effect, I’m trying to process a pitch shift from Cubase’s stock plugin onto a vocal.

When it was done processing, I played it and it seemed off tempo a bit. I played my metronome and zoomed into the waveform to do a before processing of pitch shift, and after.

Surely enough, after processing the pitch shift, the wave form has moved a little causing it to be off tempo from Cubase metronome by a hair.

I have the automatic time correction checked off already. What could be causing this problem? I don’t have any plugins on my inserts or sends at all as this is a project I just finished.