Help! Weird scene..

[berry]

I met a strange scene in my code. I succeed to call out the number i want from the database. But when I sum it up, the amount is incorrect. Even i had pop up messagebox before it do the calculation. And the number shown is correct. The only thing is when the hour add to the value in flexgrid, the answer is wrong. Please Help me. I think of it so long time but still can't get it.
Thanks a lot...

Data in the server is:
Texture 1
AW 0.5
LZT 0.5
PC 1
Texture 1
LZT 1.25

The answer that I get from the below code is:
lzt hr 1.25
lztgrid 0
tolzt1.25
tex hr1
texgrid 0
totaltex 1
totex1
pc hr1
pcgrid 0
toPC2
lzt hr0.5
lztgrid 1.25
tolzt1.5
aw hr0.5
awgrid 0
toaw1.5
tex hr1
texgrid1
totaltex2
totex2

Private Function sunday()
    AdoSun.RecordSource = "select *from downtime where Date = '" + txtSun.Text + "' "
    AdoSun.Refresh
    Datagrid.Refresh
 
    If (DGSun.ApproxCount <> 0) Then   'if row count is not 0 then calculate the total hour
        AdoSun.Recordset.MoveLast
        Do While (AdoSun.Recordset.BOF <> True)
            If (AdoSun.Recordset.Fields("Process")) = "Texture" Then
            MsgBox "tex hr" & AdoSun.Recordset.Fields("Hour")
            MsgBox "texgrid " & MSHFlexGrid1.TextMatrix(1, 1)
            MsgBox "totaltex " & Val(MSHFlexGrid1.TextMatrix(1, 1) + Val(AdoSun.Recordset.Fields("Hour")))
                MSHFlexGrid1.TextMatrix(1, 1) = MSHFlexGrid1.TextMatrix(1, 1) + Val(AdoSun.Recordset.Fields("Hour"))
            MsgBox "totex" & MSHFlexGrid1.TextMatrix(1, 1)
            End If
 
            If (AdoSun.Recordset.Fields("Process")) = "Acid Wash" Then
            MsgBox "aw hr" & AdoSun.Recordset.Fields("Hour")
            MsgBox "awgrid " & MSHFlexGrid1.TextMatrix(2, 1)
                MSHFlexGrid1.TextMatrix(2, 1) = MSHFlexGrid1.TextMatrix(1, 1) + Val(AdoSun.Recordset.Fields("Hour"))
            MsgBox "toaw" & MSHFlexGrid1.TextMatrix(2, 1)
            End If
 
            If (AdoSun.Recordset.Fields("Process")) = "LZT" Then
            MsgBox "lzt hr" & AdoSun.Recordset.Fields("Hour")
            MsgBox "lztgrid " & MSHFlexGrid1.TextMatrix(3, 1)
                MSHFlexGrid1.TextMatrix(3, 1) = MSHFlexGrid1.TextMatrix(1, 1) + Val(AdoSun.Recordset.Fields("Hour"))
            MsgBox "tolzt" & MSHFlexGrid1.TextMatrix(3, 1)
            End If
 
            If (AdoSun.Recordset.Fields("Process")) = "PC" Then
            MsgBox "pc hr" & AdoSun.Recordset.Fields("Hour")
            MsgBox "pcgrid " & MSHFlexGrid1.TextMatrix(4, 1)
                MSHFlexGrid1.TextMatrix(4, 1) = MSHFlexGrid1.TextMatrix(1, 1) + Val(AdoSun.Recordset.Fields("Hour"))
            MsgBox "toPC" & MSHFlexGrid1.TextMatrix(4, 1)
            End If
            AdoSun.Recordset.MovePrevious
        Loop
    Else    
    End If        
End Function