Your screenshot did not include the Rows and Columns Shelves, I'm guessing there's a single continuous (green) measure pill on the Columns Shelf, is that correct?
Assuming so, what you're running into is a fundamental constraint of data blending. The results of data blending are always aggregated to the viz level of detail. The viz level of detail is the entire data set, so count([sfdc_event_tracker.[Qtrs Pushed]) is returning some number > 4 and you're getting the 1 Year + result.
Without knowing more about your data I can't be sure of what to recommend, my guess is that there's an implicit dimension that you want the count() to be grouped by, in that case for the data blend to work you'll need to make sure that dimension is in the view and it will create the partitioning necessary for the data blend to work.
Apologies for not including the Shelves in the view. You are correct in your assumption.
I figured this was one of the fundamental constraints (as you say), but wasn't sure if there was some sort of workaround that I wasn't familiar with.
Thought about using a partitioned view, but ran into the issue of having to bring the field in as an attribute (rather than an aggregate) and therefore returning an asterisk due to the one-to-many relationship (though that could just be user error on my part).
Thanks very much for the help and for confirming this information.
Also, big fan of Drawing with Numbers, so thanks for all of the great content on there as well.