Lol i knew it. Same shit happened to my plants from crop king autos. I found using a simple formula of 50% fox farms ocean forest, 25% perlite, and 25% jiffy seed starter took me to harvest without any nutes, just straight up water from the faucet. Everytime i used nutes i would notice that at the beginning of flower my PH was thrown off, and the same exact thing would happen everytime with Crop kings seeds. Used the same formula with other genetics Bohdi, Green point, and a couple of other random seeds over the past few year. Never had that issue, granted those were photo plants. So a little different. Would always look like a cal mag deficiency. If i were you i would go light on the nutes. If you have the ability, check the PH of your run off.