I dont know if this is an error or It's just how EASYEDA Work, but here the deal Lets say I had a schematic and a PCB, now I change something in my schematic, then I have reannotate all components, then I hit update PCB, and bam, all my work become a mess. For example, C4 is a ceramic capacitor, located at x=100, y=100. After reannotate, C4 now is an electrolytic capacitor, old C4 becomes C8. I suppose after update PCB, C8 must be at x=100, y=100, but NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO, new C4 standing right at where I took hours to put a ceramic capacitor in. If that's how easyEDA works, I regret switching from Altium, which I have never been through this issue before.