Okay, I'm not Sure if this is a Bug for Conqueror or City Plans... I had Like 70% Settlements pre-built (I used Random) went to a Pre-built Settlement and want to Change a Residential and a Security plot, so I went to the Normal deal Clicked on Sensor and selected new design, Came up with pop-up saying that it'll reset plot to level one, No Big deal Plots were not assigned yet so changed the Guard post for Security Factory design (From Industrial City addon) and did the same to a residential plot and selected the Deserter plan (From Creations by COOTs) the security plot reset and assigned built alright, at first, so i manually assigned a settler and waited for the building to finish and it completed but when done it combined Coots plan with the original plan. I didn't notice until I reviewed the Video that the Security Plot was reset. You can see it in the Upper Right section of the Bramhin Building @1:11 in the Video. That is the one I changed.