Hi @Brice_L : Sure, I'm not sure how helpful it is though (it is what it is).

And you have a calculation error(s) in your Stacked Levene sheet (cells C33-C46).

And it appears you have some copy/paste errors when stacking.

If you clean up these errors you will see that there is no discrepancy.

That said, on to the results! (for my data)

1. Levene and B-F. via JMP

2. B-F via "Excel" method (I used JMP).

3: Levene via "Excel" method (I used JMP).