We've been having a hard time understanding the breakdown of sessions in the user flow. As you can see on the screenshot below, our starting pages are divided into 2 main groups (1 and 2), representing 70% of the traffic.
These two groups are gathering the exact same type of URLs and pages. However, they were broke down into 2 parts.
We don't understand why the two groups are not using the same box, when they share the same URLs. Pages in the >100 pages box are actually more popular than the box at the top ( 800 for the Group 2 one, 180 for the Group 1).
We are desperately trying to find an answer for this, but we can't identify any pattern of element that would help us get an answer.
Thanks in advance for your help!