Sometimes when I in Engrave mode are adjusting the position of slurs, fingerings, and articulations, fingerings in other bars starts jumping and the barlines are moved to create a mess. Sometimes I can select the affected fingerings and use the Edit | Reset Position command. Other times I have to save the project and reopen it which luckily have solved the problem until now.
Here is a link to a video showing the problem: Fingerings jumping - YouTube
I am trying to adjust the slur with the arrow keys - and also trying to undo using ctrl+z