NooB to SSRS, need help with filtering on a chart

I have a DataSet that contains the following informaitom

City              CountIt     Coast   Month

Baltimore        20            E          9
Baltimore        44            E          8
Baltimore        42            E          7
Boston           10             E          9
Boston           38             E          8
Boston           24             E          7
Buffalo           14             L          9
Buffalo          148            L          8
Buffalo          126            L          7

I have a graph that should display the data per Coast, with is does by itself.

When I try to add an additional filter on the Month, the graph displays "No Data Available"

Initially I thought that I created a conflict with 2 filters so I removed the Coast filter, but the problem still exists.

Here is what I currently have for the Month filter;

Expression :  =Int(Fields!Month.Value)

Operator: =

Value: = Month(Parameters!ReportDate.Value)   

Now the data goes back 3 months, July, August and September.

When I plugged in 7 ( for July) I had data, but nothing for August or September, but the data set has data for all three months.

Thanks