High, your Pineapple express are just bad genetics.
But the Mimosa Cake was looking great till 1-2 weeks ago. So till she reached the moment from late flowering where she needs a lot of potassium (K) and some magnesium and phosphorus (P) in smaller amounts. Now there are a lot of reasons why a plant can not absorb a nutrient and there are a lot of elements that block the absorption for others.
But to make it simple you just want to start with a clean soil. In order to archive this you need to flush the soil. I will send you a link from the RQS website from an article where they show you how to flush with video, pictures and full explanation how to flush:
https://www.royalqueenseeds.com/blog-how-and-when-to-flush-marijuana-plants-n312
After the flushing you want to give nutrients with the right ratio. So a basic bloom nutrient together with Call-Mag and a P-Booster will be perfect till harvest.
Goodluck and a happy and healthy 2023