2Ton's brushes preferences were set up as below,this resulted in him having 3 copies of some brushes
When he deleted 1 of the duplicated locations he was left with 2 copies,
I asked him to go to his userfolder/brushes and delete these folders if they are there this will hopefully leave him with 1 copy
Ideally he should only have his own added brushes in userfolder/brushes and his Preferences/Folders/brushes should look something like this↓
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No matter how much you push the envelope, it'll still be stationery.