Massive difference between Unify played sound to Stems calculated in Presonus Studio One 7

I never noticed this error before and I use Unify since 2 years by now. In Midi Session on StudioOne 7 the sound is beautiful. But after rendering the whole song it sounds different. After search I located the Unify playing "BPM Bass Dark Lab no Orbit" without use of outside Unify effects as the mistake. I tried to render only this one unify Instrument to a Stem. But like before the result sounds absolutely other, like the preset. Then I made a completely new lane with the same preset and copy the notes fresh into it, without bring possible trash from midi inside. On live playing everything is fine again, but on rendering the same as before, bad rendering so you could think StudioOne rendering a wrong instrument, but not the given BPM Bass preset of Unify. 

I'm wondering and want to fix that, so I have a given time to get the final mix to the label.

Thanx for any idea, Kay!