Found that the scale of the movement of Ender Dragon Girl's two legs are not equal ( the left is smaller ) , and after I read the codes I found that there is a mistype in
GrimoireOfGaia/src/main/java/gaia/model/ModelGaiaEnderDragonGirl.java ,
in
setRotationAngles.

Hope it's fixed in the next version! ( From a lover of dragons )

Weird that I never noticed that. Thanks for the heads up!