Flake or Crystaline look to wax
There are two things that come to my mind.
1. The wax was too hot for too long in the melter
or
2. If the scent you were using, if you we using scent, did not bond well with the wax, ie scent not stirred long enough into wax before pouring, this can cause the tops to appeared flake and crystal.
I love working with soy!