When you switch between proscribed maneuvers the software does the transformation (for example between Proscribed Dv Orbital Vector - Proscribed Dv Orbital Spherical) , but when you switch between finite duration maneuvers (for example between ''Finite Duration Orbital Spherical'' - ''Finite Duration Orbital Vector'') the software does not do the transformation, and the boxes always keep the same values, so the ''azimuth'' value becomes the new ''Prograde Dv'' value.
Given Orbital Vectors is the only way to upload maneuvers to KSP and ''Orbital Spherical'' is the only way to optimize your trajectory for a given DV value... There is a problem there.
Edit: Maybe ''Orbital spherical'' isn't the only way to optimize for a given DV, not sure.
EstrelaGaliza
commented
5 years ago 
When you switch between proscribed maneuvers the software does the transformation (for example between Proscribed Dv Orbital Vector - Proscribed Dv Orbital Spherical) , but when you switch between finite duration maneuvers (for example between ''Finite Duration Orbital Spherical'' - ''Finite Duration Orbital Vector'') the software does not do the transformation, and the boxes always keep the same values, so the ''azimuth'' value becomes the new ''Prograde Dv'' value.
Given Orbital Vectors is the only way to upload maneuvers to KSP and ''Orbital Spherical'' is the only way to optimize your trajectory for a given DV value... There is a problem there.
Edit: Maybe ''Orbital spherical'' isn't the only way to optimize for a given DV, not sure.