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I'm working with this dataset. I broke the quality class into 3 categories: low, medium and high

Then I imported the dataset into Weka 3.8.3. In the Preprocess tab i discretized the attributes (Choose -> supervised -> Attribute -> Discretize). Then I went to the Classify tab and chose J48 filter with the following parameters: binarySplits=False, confidence factor=0.1, minNumObj=40, unprunned=false.

I exported the tree visualization and I see that for example the root has 3 children nodes of type medium. Is this normal? I would expect that there'd be one child node medium instead of the three. If this is not normal, what could be my problem?

enter image description here

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