Need help: Multiple Transformations 1 Output

I infer from the documentation (plus experimenting with your file) that there should only be one twist per base geometry.

As your twists should each be within the bounds of its axis, you might get a result by slicing the extrusion horizontally at each axis junction, twist the first slice, rotate the second slice by the same angle and then do its twist and so on. In other words, split the geometry into the same number of elements as the twists and process them, then join them up again after the transformation.

HTH
Jeremy