Are you on a fresh install? Try to run the script below against your DB, please make a full backup first, just in case.
Code:
INSERT INTO ProductStore (ProductID) SELECT ProductID FROM Product WHERE ProductID NOT IN (SELECT ProductID FROM ProductStore)
The number that was added in the gooblebase filename indicates the number of products retrieved into the googlebase feed. There's no setting that can remove that, no. That was added in the later versions because if feeds reaches more than 20K products it causes a timeout error when uploading it to google.So, the solution was to create a feed which only contains 20K, the rest will be created on a different feed name.