Hi there, Check out my FB Blackberry grow I had one plant with the same but worse issue. The one plant you have with the variegated coloration probably has some type of virus. Possibly TMV (tobacco mosaic virus) It can come from the soil or if you use tobacco products that have the virus or use garden tools that may be contaminated etc. If she is strong enough she many be able to grow somewhat normal leaves faster than the virus can spread. You can keep her and see if she pulls through. Just be careful the virus can be transmitted through contact with the affected plant so wash your hands and sterilize all tools in 1 part bleach 9 parts water and soak for 5- 10 minutes then rinse clean. 👌