Offset in select options when betterselect enabled

Hi,

I like this module, very usefull for large selects.

But when I enable it, I get offset of 2 select option rows, which is very disturbing for Users.

For example, when I have an already saved node with field integer and select list like this :
1|choice 1
2|choice 2 - selected
3|choice 3 - selected
4|choice 4
5|choice 5
6|choice 6

I see after enabling betterselect :
1|choice 1
2|choice 2
3|choice 3
4|choice 4 - selected
5|choice 5 - selected
6|choice 6

So I think that I have to update this data !! While, if I don't change anything and disable betterselect, I can see the right selections.

Hope this could be helpfull.

Thank you.