Using floats returned from FPU

I have asked a similar question a few days ago, was very imprecise back then though, so here is a much more detailed post. So I am currently writing x86 32 Bit assembly using NASM and I want to use my custom function in a c++ program. I have issues working with the returned value though.

Here is my sample code in assembly:

section .data
value: dq 1.0
section .text
global _arsinh
_arsinh:
    fld dword[esi-8]      ;loads the given value into st0
    ret

Here is my sample/test code in c++:

#include <iostream>
extern "C" float arsinh(float);

int main()
{
    float test = arsinh(5.0);
    printf("%fn", test);                    //Displays -96715160...
    printf("%fn", arsinh(5.0));             //Displays -96715160...
    std::cout << test << std::endl;          //Displays -9.671512e+24
    std::cout << arsinh(5.0) << std::endl;   //Displays 5
}

All the assembly code does is load given value from the stack(5.0 in this case) and store it in st0. The problem I am now encountering is, that all but the last of the print statements display a wrong value (not 5.0). I assume the issue is that I am loading a dword and not a qword, as the following code works(displays the correct values) completly fine:

section .data
value: dq 1.0
section .text
global _arsinh
_arsinh:
    fld qword[value]      ;loads value into st0
    ret

I would like to save the returned value into a float and then do some additional calculations in c++/c with it, but I can't seem to figure out how to do that, as I have no choice but to load the given value as a dword.