I just think I'm getting mislabeled boxes since they make both a 1/8 and a 3/32 version of the same crank.
Well, we can't measure it for you. My shimano ultegra and 105 chain wheels measure about .083 down near the bottom of the notch. My RaceFace Cadence is even narrower. So they are well under 3/32" (.09375").
Do you feel you put enough pressure on the chain when you put it on to move the rollers to position? Sometimes the rollers on a link will take some pressure to pop them back to where they need to be.