Hi can you please provide any screenshot/video out of it?
When you report a bug, please use a title that reflects the issue. When you have a title that reads, "/rob system not working," we assume that players cannot rob other players using the /rob command. Therefore, I'm changing the title of this post so it reflects the issue you are reporting. Like Astro said, please provide video or screenshots which will help us determine if it is an issue or not.
I can confirm, the /actions does not properly show the actions of /rob, If I remember correctly, the /rob only comes out in /actions to the player who has committed the robbery, this makes some player complaints complicated due to lack of evidence.