Misalignment of subscript

mauro sacchetto

I am proceeding to work on my font, also thanks to the competent help of this forum.

Now, I think I have set metric values ​​if they are not perfect, at least such as to produce an acceptable result.

However, one thing does not work: subscript letters (not figures).

At first I didn't set any value in OtherBlues, then I tried, but the result is always the same on Windows (with Adobe Acrobat Reader at the default resolution):

We see that <v> <w> <x> <y> <z> are not aligned at all. I also tried to modify the values ​​of the StemSnap, again without result.

And now I don't understand if the misalignment depends on the OtherBlues or StemSnap(s).
What is relevant in this case?
I enclose the font, if anyone wanted to look at it
https://www.dropbox.com/s/0bnux6ejv8srjld/test-Regular.otf?dl=0

Thank you!