Leaves curling up, overfertilization? flowering stage

I'm flushing now both of them and I'll wait for two days or so and give more bloom nutes as @Denge advised me. Overall I'll give them fewer nutrients. Hope this will work.

most likely, and double so with an autoflower. could be lockout.. could be pH if you don't control that. even though the other plant can handle it, doesn't mean much for this one. adjust a bit early when you see the symptoms present themselves. it's always safer to rule out a toxicity first then move to eliminating the potential deficiencies before dumping anything into your substrate.

2 plants can react differently on the same feeding My I’m thinking your plants are suffering from a phosphorus deficiency I would say cut the grow nutes and up the bloom nutes Happy growing and stay safe 🌱✌️

Second one I think looks healthy, but yellow leaves around central budsite may indicate same problem too? or its normal for flowering? its my first grow and I'm learning.