Histogram slicer issue

Hi, I'm trying to get a histogram to work with a measure. It shows ok when no filters are applied, but as soon as I use a slicer or something, everything that doesn't meet the slicer selection gets dumped into the zero bin, rather than being removed. 

I've got a table defined for bin sized, and my DAX measure for my values for the histogram is:

BIN Sprays per block = CALCULATE(Countrows(FILTER(VintBlock,And([Sprays per Block]>=Min(Bins[Min Bin]),[Sprays per Block]<Max(Bins[Max Bin])))))

I've got the same data model setup in Power Pivot in Excel and it filters ok there. I'm not sure what's different. 

Sprays per Block is the measure that I want to count, which is defined like this:

Sprays per Block = DISTINCTCOUNT(Sprays[Spray record by block ID])/CALCULATE(DISTINCTCOUNT(Sprays[Vintage Block ID]),ALL(Sprays[Month],Sprays[Sulfur Rate]),All(Pests),All(EL_Stages),ALLEXCEPT(Chemicals,Chemicals[Chemical class groups]))