> Model not sticking to the bed. Behaviour was inconsistent.
Crank the exposure time for the first 10 layers up. Way up, like 10x the exposure time for normal layers. They'll come out noticeably oversized, maybe 0.3mm bigger than you wanted. Adjust the model to compensate.
(Assuming you've already levelled the print platform etc in line with the manufacturer's instructions and your resin is OK)
The common wisdom (this is back when I was still fiddling with an Elegoo Mars 2-3 years ago) was to print the model at an angle and elevated from build plate. There should always be rafts and supports under the model.
Crank the exposure time for the first 10 layers up. Way up, like 10x the exposure time for normal layers. They'll come out noticeably oversized, maybe 0.3mm bigger than you wanted. Adjust the model to compensate.
(Assuming you've already levelled the print platform etc in line with the manufacturer's instructions and your resin is OK)