Grails 2.0 integration test pollution?

Question

So i have a small integration test that houses 5 tests in total. Running that test exclusively results in all tests passed. However running my entire test suite results in 4

Answer 1

My solution as to upgrade all the unit tests to grails 2.0 method of doing tests. When this was done, every test passed. So it seem's that unit tests somehow polluted integration tests. But only on certain hardware configurations.