Blank Cards after Publishing in Workspace

Hi, 

I'm wondering if someone can provide some suggestions on why my cards are blank in my workspace. I've provided a visual below, this report consist of a query and an excel spreadsheet. About a week ago, the report refreshed just fine and all of the data populated, however when I updated the excel sheet on the backend the whole report seemed to have crashed and was giving me an error message that it couldn't display anything. I went ahead and disconnected the report from the gateway, deleted the report, and reuploaded it to the workspace, connected it back to the gateway. Now I'm not receiving any error messages but the cards are all blank including the queried data. I did read some previous posts where folks had similar concerns, I doubled check that the date fields were set to the correct time series and I don't have any true/false values so I don't believe that to be part of the problem. Not sure where I went wrong, but any suggestions would be greatly appreaciated.