Overwatering a seedling in the first two weeks is the classic autoflower mistake because the plant has no vegetative period to recover in. A photoperiod plant stunted early can simply be vegged longer, but an auto starts flowering on its internal clock regardless of size. Some of the stunted plant photos on
https://turboautoflowerseeds.com show exactly what a two week setback looks like at harvest, and it is not pretty. Keeping the medium light and airy during that window matters more than anything you do later.