VB6 - Sort ID AutoNumber descending issue

Hello all

I have a MSHFexgrid1 that have data from my Microsoft Access dbase.

I want to sort column 1 that have the ID AutoNumber from  MS Access.

The problem is that when i do this, i see that result:
99
98... 'going down
89
88...  'going down
29
28...  'going down
100
1

So i don't have a real descending sorting.

How can i fix this?

Thanks again

Full code

'Sort grid
            With MSHFlexGrid1
                .Col = 1
                .Sort = flexSortStringDescending
            End With