weird elevation shadows on roof

[Dave Brach]

can somebody help me with why I am getting these strange shadows on my roof surface in elevation?  this is looking at the side of a pitched roof.

 

[Igor]

Try to change the settings of the sun, it probably shines from below)

[DGSketcher]

@Dave Brach Duplicate surfaces? Unlikely but possible.

 Have you possibly got something modelled on a higher / upper storey that isn't visible in the elevation?

[amgam]

100% chances of there being at least 2 elements intersecting, check that. May be more problems, but this one is definitely there.