A project is only triggered for one parametrized configuration not all configured items.

test case:
Create freestyle jobs A, B, C.
Job B and C should just echo P as a build step.

In job A configure the post build item "Trigger parameterized build on other projects"
with the following
Trigger 1:
job B
trigger when STABLE
Predefined Parameter:
P=STABLE

Trigger 2:
job C
trigger when UNSTABLE
Predefined Parameter:
P=UNSTABLE

Trigger 3:
job C
trigger when FAILED
Predefined Parameter:
P=FAILED

Now Run Job A, with the results
Stable,
Job B started.

Unstable
Job C started "UNSTABLE" echoed

Failure
Job C is not started

We would expect that job C would start in both the unstable and Failure cases echoing the differing parameters.