In theory geomatric opperation like mirror or roation should cancle each other out and not distrub the geometry itself but in EasyEDA it does.
simple example using a single net lable (is an issue everywhere and not exlpainable with grid/snapping):
![image.png](//image.easyeda.com/pullimage/mwJDh6BwanajNcdniAR8n4RVZS0j4LVHDQlBOjrb.png)