only drama ever in the german version was with that pro dancer couple
Erich Klann & Oana Nechiti leaving the show because they felt too good to be dancing with celebrities, and felt they were underpaid

which is nonsense, each pro gets a decent salary by RTL, but no one gets more salary than others, and the amount of salary you earn is determined on how far you get in the competition each year, equal pay as for what the celebrity gets etc
and Erich & Oana were spouting negativity about the show on their vlogs what they used to do, so yeah RTL wasn't happy about that either
but that is basically only drama they ever had, and now no longer much drama but more one big family among the pro's, Vadim left the show for a few years but he's back in a better form now, ever since challenging himself with doing same-sex partnerships in austrian and in german versions of the show, gave him a confidence boost he needed also for dancing with female celebrities