From what I can tell you have your preferences set right. Does this only happen at barlines? If so, there is a setting to prevent hairpins from crossing barlines. I added a link to the German section of the manual:
thank you very much. No it also happens inbeetween measures. I applied my in the first post descripted settings many times before and every tims it worked since today. And that ar my basic settings. I don’t add them today but checked them and saw them well adjusted. No idea what’s different today….