Jenkins build numbers

I have been doing some testing with the Jenkins plugin to be able to automatically trigger some jobs in there if certain Custom alerts are triggered in our IDR.

I did notice that when I use the Jenkins plugin to start a build it doesn’t return the correct build number.
Ex the build number in Jenkins itself shows 101 then the build that the plugin in ICON shows is 100.
So for some reason ICON is 1 version behind.
Any ideas why that might be happening?