How did you set up the response in this analysis prior to launching Oneway platform? Is it a data column in the data table? Or did you transform it in the launch dialog?
 
I cannot reproduce the problem you have. Here is :weight by :age (original variables):
 

 
Here is the analysis after creating a new response column with a formula:
 

 
Both the ANOVA and Unequal Variance use the same transformed data. Here is the result using a virtual formula:
 

 
Again, both analyses use the transformed response.