1-2mm is huge, and definitely not expected.
I’ve recently printed a retention piece to hold a PCB, dimensioned to a tenth of a millimeter, and it fit perfectly.
IPA does swell prints, if you keep them in there for a long time (say, an hour or more).
Curing can only warp them (if thin).
I’d suggest printing some calibration pieces in various orientation and measuring them to figure out which axis is off. If it’s both, the same amount, something is likely off somewhere else in the process.
Which resin were you using?