>>I added a card and its filtered to April which is blank (See the second column is blank)
>>Which is correct and If I add a card on here and add a slicer and go for April its fine.
From your description, I am not sure what desired result would you want, could you please share your sample data or desired output screenshots for further analysis? You can also upload sample pbix to OneDrive and post the link here. Do mask sensitive data before uploading.
When you hover on one data point, the drillthrough page will return data about the data point. In your scenario, you may hover on the "14288" then click drillthrough. If you need to see all the data, you can choose the "Show data" option via click the ellipse in right upper corner of visual.