Before storing the data into QVD there will be some script before store command. Where is that script and is that script file (if its a qvw file) scheduled to refresh and store into QVD? Need more info. Usually you should have something like this:
1. 1stQVWFile with a SCRIPT to pull data from data source and store it into QVD.
2. 2ndQVWFile which is like your dashboard pulling the data from this QVD.