That sucks, next time use NPK's Mighty or better yet get the brix up and the bugs wont even see the plants. I bet if you check the sap that one has a brix under 5% and the others are over 8%. Why is where the mystery begins for me

This is a good link but there are many

https://www.dinafem.org/en/blog/brix-degree-value-development-cannabis-plants/