Those two operations are based on two different analyzers. At this report dimention "Analyser" is hidden that's why You do not see difference.
It comes from different scenarios:
1. There was upgrade from previous verion and before upgrade You were using AMD Classic (Analyzer Oracle Forms over HTTP) and after upgrade You have AMD HS (analyzer HTTP).
2. You aggregates data from two environments one is AMD Classic
(Analyzer Oracle Forms over HTTP) and second is AMD HS (analyzer HTTP).
I have performed an upgrade previously indeed, but there is no HS-AMD involved in this case, it is still using classical.
Also, I try to add another column in the table, and this is what I get:
By the looks of it you are in the Operations report. This report by default has task module and service included as dimensions but it is set to hidden under the results display tab. Any unique values in these will still cause the rows to be separated.
From the top of my head I can't remember which ones are set in OF but they will be things like the module name and window title. What i suspect is you have the same user action being performed on multiple modules.
To confirm this simply go to the results display tab and set all of those to Show Yes.