Hi, new to hatching, first attempt being last month. Had eggs shipped, 5 of the 15 grew chicks. On day 21, one hatched. On day 23, candling showed the other 4 dead. Cracked them open and based off picks from several web sites of embryo development, it would appear that all 4 died about day 19 or 20. Bator was in lock down end of day 18 and nothing traumatic happend during lockdown. Upon cracking open the 4 eggs, none had even interior pipped. No water was in airspace so don't think humidity was too high yet embryo's seemed nice and moist/slimmy with no shell sticking to them as I pulled it apart so also don't think humidity was too low. Then of course the one hatched just fine. Am very sad of course and confused why the 4 just died for no apparent reason. Is this normal, do they just die sometimes for no reason? Any ideas what might of happened? Thank you for your help.