Fakhriyya Mammadova

I have two structures at the same time and I measure their transmissions at the output. Both of these structures have 3 inputs, and the structures are already optimized in a way, that if I set one source at the input of one structure, the output transmission is 1. So I have set 2 sources: one per each structure. The problem is that I know that the transmission at my foms must be about 1, but I receive 0.5. So I was thinking if there is something with the setup of the program that makes the source's transmission drop. Or since I use 2 sources, do I have to assume that this 0.5 is actually 1 if I have to multiply it with the number of sources?