Scratching my head to work out how this has happened. I suspect the date was in the process of changing and you've used the quickset. The wheels that drive the date wheel have changed their position relative to the hour wheel which they're driven by. Possibly one of the wheels has lifted and essentially 'jumped a tooth', never seen this before but it's the only way I can see to explain what's happened. Alternatively a tooth may have broken. Are you sure everything works OK? Try the quickset date change and feel for any roughness at one spot. If all's working well I wouldn't do anything, but I suspect all isn`t well.
This requires the dial side to be stripped down and the dial removed to rectify. I don`t know which Selita parts are interchangeable with ETA 2824 on the dial side, most repairers will have a few ETA parts kicking around but Selita parts are rarer. I doubt that the date wheel itself is damaged but I could be wrong, if that's a Sinn-specific part it'll have to go back to Sinn for fixing.
When setting the date the golden rule is to STOP turning the crown if something feels wrong, this will prevent damage, but often the enthusiastic owner has already done the damage before the message travels from brain to hand. I`m not infallible, I`ve tried setting the using a quickset on a watch then realised it feels wrong and stopped before damage gets done.