Holy Moly - 3-4 cm difference. Christ.I have to check/double/tripple check my heights. All bikes are spot on the same, the fixed is literally just a couple mm lower to aid spinning.
That will be the cause !!
Same goes when changing pedal systems - e.g. allow for difference in cleat height, hence slight differences between my two road bikes on Look, and the fixed/MTB on MTB SPD's.
Sould sort itself now you've rested it.
Yeah silly thing to do.. should have double checked.
I'm a one cleat system all bikes type person.