It would be good for you to start a diary so that we have ALL the information ... but without that, let me first tell you that autos are apparently a LOT more finicky than photos (I don't know, tbh, because all I grow are autos!). This is looking like a calcium deficiency probably brought about by too much nitrogen causing a lockout... so no matter how much calmag you give, they're not able to access it... I would start with a flush, adding 1/2 strength nutes to the last gallon and let them dry out before watering them again. When you resume nutes, cut any nute you're giving that has a lot of nitrogen in it by half...
Good luck - and please start a diary so that if any other issues or questions come up, we'll be better positioned to suggest a good solution.