Problem with Grouping + Fx offset

Hello,
When I do a buddying on several fixtures, I apply their an effect, I do a shuffle selection and I write in offset cell: 0 °> 315 ° (for example)
Then all fixtures will have an offset without complying the grouping requested.

For example: with 9 projectors, a buddying 3 and a shuffle selection:

Logically if I type an offset 0> 315 we should have an offset like:
fixtures 1 +2 +3 = 0 °
fixtures 4 +5 +6 = 315 °
fixtures 7 +8 +9 = 158 °

While here we have:
fixture 1 = 158 °
fixture 2 = 315 °
fixture 3 = 0 °
fixture 4 = 0 °
fixture 5 = 158 °
fixture 6 = 0 °
fixture 7 = 158 °
fixture 8 = 315 °
fixture 9 = 315 °

Would it not make more sense that the shuffle selection applies to the buddying and not on each fixture (from the point there a grouping)?

Regards