Pivot sheet won't show what I see in Preview

Hi there,

I created a pivot report that sorts items by month. I have 19 columns with two rows currently -- January and February. When I look at the sheet that I created with Pivot, it only shows that data that is not assigned to either January or February (BLANK). I can see what the data should look like when I click the Preview button. I click Create and then check the sheet and see nothing. I have other reports built in a similar manner that work just fine, so I'm not sure what's happening. Any ideas?

Thanks!

Jackie