Why the difference in active users

Below are screen caps from two different runs of my gatling tests. I have three scenarios that are combined for one scenario. Each scenario is injected via this line of code.

cmcUsers.inject(constantUsersPerSec(cmcUserNum) during (dur minutes))

The values are set via env values and both tests below were started with the defaults of

10 users
15 minutes

The only difference is that one is being started from my Macbook Pro laptop (top cap) and the other is running on a Ubuntu server. Both are started via maven and both have the identical code and pom. Why the huge difference in active users?

Anyone have any ideas?

Honestly, no idea. If the system under test is the same, look for network and network tuning differences.
But this has nothing to do with Gatling, but with the environment.