Lauren, it's hard to tell without seeing the workbook, but...
What is the actual value in the database for the Baseline/Control cell? It shows as 5:9 in the screenshot but what is it really?
My guess is that that is your problem: The other values are what look like mm:ss values but that one is not in the same format.
Hmm. Tableau sees something different about the intersection of baseline and Control vs. post_training and Control.
Are you pulling this data from one upstream table or from a join/blend in Tableau? There are cases where a join or blend could result in duplicate rows that are subtly different.
Is there another dimension you can put in the view to see what makes up the summed values for Control (I'm assuming that's a sum)?
Yes, there is definitely something going on, I just can't pin point it because if I was running select statements in SQL directly I wouldn't have this issue. So I'm not sure what Tableau "sees" differently.
I am pulling from one table (no joins or blends). In pulling in another dimension (version), it further split out "control" into now a third bucket.
And these are just aggregates.