<br> <br> So I had recently a PCB made, and assembled. It came back perfect ! But, when I was placing another order, I noticed that there was a "DFM Analysis" from that project, and I took a quick peek at it. Apparently, JLCPCB guys had to "fix" the placement. Please see this image: <br>  It appears from this image that the placement was "rotated". However, before placing the order, I DID verify the PCB and placements in the 3D viewer and JLCPCB Gerber viewer. I did not see any such errors. My Question is, what did go wrong ?  How can I avoid this type of errors in the future ? It might be not as obvious on more complex PCBs what needs to be done .. Many Thanks, rudi