why the value in the column X is cleared
 

In effect when i insert "5" in the txtbox38 automaticlly the cursor go
in the txtbox39 and i insert some word.

The value of txtbox39 is inserted in the column X of the related
sheet.
but during the scroll with the scrollbar the related value inserted in
the column X is cleared (BOH!!!!!!)

http://www.gssitaly.com/l0785_def.zip