why the Builds is not triggered in all compatibles agents?

Hi,

I have an exe which it run in 3 agents using one build A and crontab trigger in each minute the exe will run with the option to run on all compatibles agents.
After that i have another exe (exe2) which will be run after a success of the build (So the exe2 is a build B). So i'm using a dependency and the "finish build trigger" on the build B
But the problem is that just one agent  will run the exe2, instead of running the build B  in all compatible agents agents ?

I want to understand why this is happennig and how to resolve it without creating a build for each agent.