In other words....reinforcing armies are rather buggy, no matter the formations being used or the mod being played for that matter. They were buggy in vanilla as well. Although, if the attack/defend formation(s) within all the formations themselves are not modded correctly or perhaps are a bit off in where units are placed within the blocks in the formation itself, it could make what's an already buggy situation even worse. FYI, unit settings (as defined by other files) do have an effect on how the units themselves interact with this file.