Why do I not see all publishers in my PR/TR/DR report created in CELUS?

You probably haven't set up your credentials correctly and CELUS is not harvesting all the reports you need. You can see which reports are being harvested for individual platforms on the SUSHI Management page:

In the screenshot above, you can see that only TR and DR report types are currently being harvested for this particular platform (Infobase). To change which report types will be harvested, click on "EDIT" and in the following dialog, remove or add the report types as you wish. Usually, CELUS will help you with this by showing a little blue or/and green icon next to the report - the blue R means that according to the COUNTER Registry, this vendor provides the report type. The green icon means that other users harvested this report successfully.

The next step is to verify the credentials by clicking on "SAVE and VERIFY":

CELUS will try to harvest the report, if the harvest is successful, the SUSHI credentials are verified and prepared for harvest. 

Now you can happily harvest the reports for the months you need it for your analysis. Not sure how? Please refer to this article.