Call graph in C language

I'm using doxgygen to generate Call graph for C file, i noticed that doxygen
generates the same call graph for header file(*.h) and for c file (*.c)
My question is why doxgygen duplicate call graph for function, ones for *.H
file and ones for  *.C file?
Call graph for *.H file is duplicated and not needed, is there a way to get
around and generate call graph only for *.C file?

example:
=====call graph for H file======
digraph "Function_init"
{
  edge
[fontname="Helvetica",fontsize="10",labelfontname="Helvetica",labelfontsize="10"];
  node [fontname="Helvetica",fontsize="10",shape=record];
  rankdir="LR";
  Node1 [label="Function_init",height=0.2,width=0.4,color="black",
fillcolor="grey75", style="filled", fontcolor="black"];
  Node1 -> Node2
[color="midnightblue",fontsize="10",style="solid",fontname="Helvetica"];
  Node2 [label="Function_RstSw",height=0.2,width=0.4,color="black",
fillcolor="white",..."];
}
=====call graph for C file======
digraph "Function_init"
{
  edge
[fontname="Helvetica",fontsize="10",labelfontname="Helvetica",labelfontsize="10"];
  node [fontname="Helvetica",fontsize="10",shape=record];
  rankdir="LR";
  Node1 [label="Function_init",height=0.2,width=0.4,color="black",
fillcolor="grey75", style="filled", fontcolor="black"];
  Node1 -> Node2
[color="midnightblue",fontsize="10",style="solid",fontname="Helvetica"];
  Node2 [label="Function_RstSw",height=0.2,width=0.4,color="black",
fillcolor="white", .."];
}




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