Test Suite Collection - Mac - Firefox browser runs in background / does not get brought to front

OS - MAC
Browser - Firefox

When I run the test suite against Firefox, it brings it to the front and all tests run fine
If I run the same test suite via a test suite collection it fails because the browser is not being brought to the front, it runs behind the other windows / katalon window

Any idea why this might be / anyone find a way around this?

Cheers!