Hi all. I would like to realize a PCBA on JLCPCB. I have a only one SMT reference on the bottom side of my PCB. On JLCPCB Review Parts Placement viewer, all of them are shifter as you can see here :  My Gerbers and pick and place files come from EasyEDA directly without modification. I don't understand why the SMT are shifted and the JLCPCB is not very helpful.