Please see:
What is new in v5.1.3
2018.01.22:
Improvement:
Solved the auto router will remove the existing tracks when disable the "Remove the Existing Tracks" option issue, we change this option to "Skip the Routed Nets".
in:
https://easyeda.com/Doc/Tutorial/WhatsNew.htm#Updated-Instructions
![enter image description here][1]
[1]: /editor/20180123/5a6740abc04e8.png
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