Hello,
Please mention the steps done to create this handrail, cause we couldn't reproduce the problem after deleting the existing one and recreate it, by choosing the outer stingers and rafter as support beams in a succesive order, and then choosing the start and end point off the railing by respecting the same order from the beam selection - the handrail was created correct without the gap in the middle rail.
Regards,
Dumitru Berteanu