PostFEKO solution and block number?

When viewing say my input impedance simulation results in FEKO, there are options for choosing which frequency, solution (solution number), or source (block number) to plot. For most simulations, the solution number allows me to choose the port I want to plot the input impedance for. However, I'm currently running a 2 port simulation, but I have 3 solution number options, each giving different results. Why is there not only 2 solutions for my 2 ports? Also, for the 3rd solution number, it gives 2 sources (block numbers) to choose from (each giving a different result).

What do the solution and block numbers really refer to in FEKO?