You need to update the relationship between your data sources.
First, I can see that in your JOIN dataset you have the Created MMYY field. You'll need to make the same field in the same format in your data source sc_req_item (as your RFS from Dec 2017 uses this data source). Right click on the data field from sc_req_item and create a month/year custom date field.
Now, in a worksheet, edit the relationship between the data sources Join and sc_req_item :
Add in a new relationship:
Select the two MM YY fields and click ok.
Now go back to your dashboard, and you should be able to check on the worksheet