Double edges?

consider the following graph:

digraph "server"
{
graph["splines"="curved","overlap"="scalexy","rankdir"="LR"]
node["fontsize"="8px","fontname"="arial","shape"="rect","margin"=0,"pad"=0,"style"="solid"]
"1" -> "2" ;
}

GraphViz creates two rectangles, and two edges between them, both with arrows pointing from rectangle 1 to rectangle 2. I would have expected only one edge.

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