Slicer displays different text when not selected

Oh, so there isn't a relationship between your dimension that holds the slicer values and your fact table? Instead you're filtering within the DAX measure in the table based on the selected value of the slicer? Well... you can conditionally format the title of a slicer, so you could have that change depending on the selection. But you would still have text inside the slicer button. You could get around this by replacing the value of "6H Only" to be an empty character so text wouldn't show up in the button.