Short gutters not mitering

[vanderloo5]

Does anyone know the trick for getting the short gutters on my roof overhang to mitre?
All of the long runs mitered fine but a few of the short runs square off??
See illustrations in revision clouds.
Thanks92429

[Dimitri Harvalias]

Are you picking them all as part of the same 'sketch'?
Have you tried selecting in 3D?