Please Help: Slicer Issues - Not displaying all months to select from

Hi,

I created 2 slicers "Month" and "Department" there are different department numbers so when I go to choose say department 2 instead of giving me the sum of months Jan, Feb, March, and April. It only displays Jan and Feb, I am not sure why this is, the raw data where all my data is in one tab and everything is the same format. Is this because of the size of the data? I have 50,000 rows I am working with.

Please advise. Thanks.

Pigment01