Thanks for pointing this out. Just checked my board that has just been ordered and it has the same problem....

I can confirm that there is something strange happening to the inner layer numbering. Also, when I uploaded the downloaded Gerber files generated from a 4 layer PCB from a project created in EasyEDA: 1. The upload analysis results seem to be unhappy about some of the files generated by the EasyEDA Gerber generation: ![enter image description here][1] 2. the JLPCB Gerberviewer only shows the top and bottom layers. There does not seem to be a way to view the inner layers. If I check the same Gerber files in the EasyEDA Gerber Viewer as they are generated by EasyEDA directly from the `Gerber Output...` button, I can view all the layers and they appear to be in the correct order. [1]: /editor/20180206/5a78a2819f50e.png