The Pro traverse defaults to tangent direction when entering a curve. Try entering your curve bearing as 85-55-13-3 cb.
The "cb" tells Pro that you are entering a chord bearing rather than a tangent.
PS - You should check out the shortcuts for the Pro traverse, as there are a number of really handy ones. I don't see radial bearings and delta angles often, but being able to quickly and easily incorporate them into my traverse is really great.