Totally confused with the unstable lines

Pls see the two vids below I’m totally confused with the unstable lines took much of my time today experiencing many tricks but no answer! when I lock them then the app says that the existing constraint prevents from doing any further actios.


So sorry for the inconvenience! Could you please share the workspace with us so we can investigate further?


Sorry much tired can’t even at a glance look at the workspace again until a recovery! :neutral_face: but the workspace is what I sent to Peter earlier today before I came to this point.