I assume you're using the BB spindle that's already in the Atala frame? Measure it and compare it to the BB that came with the Triomphe.

Also, what is the make of the BB spindle? It's possible the taper is more narrow than that required for the Triomphe crank, so it's sitting deeper on the spindle than it should. You can compare the taper width to the original that came with the Triomphe. Or are you using the Triomphe spindle with the cups that were in the Atala? It's possible the cups in the Atala are thicker than the Triomphe BB cups, which effectively shortens the overall spindle length.