Twisted folded plate length is calculated on the inner/outer/centre radiuses based on the state of the following default : Expansions method for unfold, found in GAM / General / General.
Curve beams have two lengths that can be displayed in BoMs : System length, which represents the length of the red axis. The system line position can be centred on the beam, or offcentred - based on the respective modelling, and also Section length. The value of this length is either the outer length, or a centre radius(not related to the system axis, the centre radius in this case will always reffers to the beam positon). To control this value, you need to check or uncheck the following default : "Curved beam length calculation method" (GAM/Beam/General).