I upgraded to Enterprise because I need tiers.
I set up 2 tiers and registered affiliate 1 and affiliate 2.
I put the affiliate 2 below the affiliate 1.
I made a test purchase on the site using the affiliate link 2 to see how it would be to compute the values for both affiliate 1 and affiliate 2.
Good, no value appeared for them and is set in Tiers 0.05% for 1 and 0.02% for 2.
see the photos below