Progress bar in NSTableCellView changes to other cell when scrolling

Hello, I'm not I00% sure how to ask this, so I apologize if I word it wrong.

This is Obj-C from an older project I have. My app has a NSTableView and each cell has a button to perform and action and shows a progress bar in each cell. The issue I'm running in to is when I scroll down while a task is running the running progress bar shows running on a different cell. So if its he 2nd from the bottom and a scroll an even number of row its equivalent is now showing the progress bar. How do I target just that one cell; making it unique?

Progress bar in NSTableCellView changes to other cell when scrolling
 
 
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