Setting multiple sources in a voxel for DPK simulation

[ShahinGHD]

Hi everyone,
I am trying to put all the sources from Ac-225 to Bi-209 in a single file in order to avoid doing 7 simulations separately.
what I do is this:

:start source definition:
	:start source:
		library       = egs_internal_source
		name          = the_source_location
		geometry      = phantom
		charge        = 0
		regions       = 7812
		weights       = 1
		:start spectrum:
			type   = monoenergetic
			energy = 1.0 # Input is ignored
		:stop spectrum:
	:stop source:

	:start source:
		name        = the_source_1
		library     = egs_radionuclide_source
		base source = the_source_location
		:start spectrum:
			type          = radionuclide
			nuclide       = Ac-225 
			alpha scoring = local 
		:stop spectrum:
	:stop source:
	
	:start source:
		name        = the_source_2
		library     = egs_radionuclide_source
		base source = the_source_location
		:start spectrum:
			type          = radionuclide
			nuclide       = Fr-221
			alpha scoring = local
		:stop spectrum:
	:stop source:
	
	:start source:
		name        = the_source_3
		library     = egs_radionuclide_source
		base source = the_source_location
		:start spectrum:
			type          = radionuclide
			nuclide       = At-217
			alpha scoring = local
		:stop spectrum:
	:stop source:
	
	:start source:
		name        = the_source_4
		library     = egs_radionuclide_source
		base source = the_source_location
		:start spectrum:
			type          = radionuclide
			nuclide       = Bi-213
			alpha scoring = local
		:stop spectrum:
	:stop source:
	
	:start source:
		name        = the_source_5a
		library     = egs_radionuclide_source
		base source = the_source_location
		:start spectrum:
			type          = radionuclide
			nuclide       = Po-213
			alpha scoring = local
		:stop spectrum:
	:stop source:
	
	:start source:
		name        = the_source_5b
		library     = egs_radionuclide_source
		base source = the_source_location
		:start spectrum:
			type          = radionuclide
			nuclide       = Tl-209
		:stop spectrum:
	:stop source:
	
	:start source:
		name        = the_source_6
		library     = egs_radionuclide_source
		base source = the_source_location
		:start spectrum:
			type          = radionuclide
			nuclide       = Pb-209
			alpha scoring = local
		:stop spectrum:
	:stop source:
	
	:start source:
		name         = the_source
		library      = egs_source_collection
		source names = the_source_1 the_source_2 the_source_3 the_source_4 the_source_5a the_source_5b the_source_6
		weights      = 1            1            1            1            0.97          0.3           1           
	:stop source:
	
	simulation source = the_source
:stop source definition:

I am getting the wrong result compared to simulating all the nuclides separately, can someone please suggest me a solution here?

thanks