I just checked my bread maker instruction book on making gluten
free bread and it says:
The order of putting in ingredients is different
Please put in the ingredients in the following order so that the
gluten free bread mix is well mixed. (The wrong order may
result in poor rising)
- water, salt, fat
- gluten free bread mix
- dry yeast
May be it's the order you put in the ingredients...... not
sure but worth the try and see if it turns out better.
Good luck!