What’s going on here?

In late flower and this is starting to take over the leaves. Using DWC 5 gallon buckets and Humboldt Secret nutrients Base A+B and cal mag+ iron, flower stacker, and a touch of their golden tree(this shit is stinky peew). What am I doing wrong to cause this to happen? It already happened and took over another plant and I’m trying to avoid it from doing the same to this baby girl.