@Dell boy nailed it
Youre over feeding a bit but if it was really bad you would have some curling and other symptoms... I get the same yellowing tips in tlo soil... with no added synth nutes at all. Usually when the plants are in the first couple weeks of flower, if I have made the soil a little too rich but they tend to grow out of it... in your case, I think that you should feed less frequently for a while or cut back your feeding amounts... autoflowers can be sensitive to synthetic nute levels that photo period plants wouldnt be bothered by...
@Mañ'O'Green would probably have more insight... im just a dirt guy..