DSP blocks

Hello

I am synthetizing a FFT on Arria 10. The compiler report gives 136 DSP blocks are used including:

32 floating point multipliers

32 floating point addition of products

72 floating point adders

(32+32+72=136)

For me it does not add up because the same DSP blocks that do the multiplication, do as well the accumulation. So at maximum we should have 104 DSP blocks (32+72).

how can we explain this result ?!

Thanks in advance