[phenixbb] problem on phenix refine

Hi all: I do not know if someone mentioned this problem here before. Recently I ran the AutoBuild to build the structure model, and it outputs a best model(R/Rfree 0.20/0.24). After that, I tried the program Phenix Refine using the .pdb and .mtz generated by AutoBuild. The R value increased to 0.23/0.30 by the end of this refine. I wonder why this happened? Or if I have done something wrong? --