Hi @ReyOrtiz,
Let me confirm something with you, Category is a single-line-of-text column type, right?
Based on this, I think there is something important you should know about the Pie Chart:
1). There must be a column to store the percentage of each item out of the total number of items in the column
2). If there is not, you should add a temporary column to sum the total of each item
3). Use GroupBy() instead of Distinct().
Here is a demo for your reference:

In your scenario, you should modify your formula as below:
AddColumns(GroupBy(Filter(CETroubleshooting_tracker,Territory=ComboBox8.Selected.Result),"Category","CategoryG"),"Qty",CountRows(CategoryG))