Stopwatch issue

Hi everyone,
I tried to create a stopwatch form but it gives me wrong values and can't figure out where the issue is.
Can you help please? I hope that the two screenshots shows exactly what the problem is.
Thanks in advance.

This is the code:

Dim startTime As Single
Dim TimerOn As Boolean
Dim TimeToCall As Date
Private Sub CommandButton1_Click()
DT_counter.Hide
End Sub
Private Sub ExitButton_Click()
Unload Me
End Sub
Private Sub resetbutton_Click()
Down_time.Value = 0
StartT.Value = 0
StopT.Value = 0
End Sub
Private Sub StartButton_Click()
    Down_time.Value = 0
    TimerOn = True
    startTime = Timer
    StartT.Value = Format(Now, "hh:mm:ss")
End Sub
Private Sub StopButton_Click()
    Dim finalTime As Single
    finalTime = Timer - startTime
    StopT.Value = Format(Now, "hh:mm:ss")
    Down_time.Value = Format(finalTime, "00:00:00")
End Sub
Private Sub UserForm_Initialize()
Call CenterForm
End Sub
Private Sub CenterForm()
If Application.Left > 1000 Then
    With Me
        .Top = (Application.UsableHeight / 2) + (Me.Height / 2)
        .Left = (1.5 * (Application.UsableWidth)) - (Me.Width / 2)
        .StartUpPosition = 2
    End With
Else
    With Me
        .Top = (Application.UsableHeight / 2) + (Me.Height / 2)
        .Left = (Application.UsableWidth / 2) - (Me.Width / 2)
        .StartUpPosition = 2
    End With
End If
End Sub