VBA For Next Loop through a range - excel

Question

For the first row of my range data, everything works fine. When I execute "Next cell", it moves down to the second row of data, but the first value is from the second column of data.
Example: data is from columns K:N. The first data is in row 2. When it goes to "Next cell", the row changes to three, but cell.value = the value from column L row 3 instead of column K row 3. Is this normal? Shouldn't it start with the left-most column when I move to next C and the row changes? Thanks!
Function Modifer_Analysis()
Dim modRng As Range
Dim cell As Range
Dim i As Integer
Dim col As Integer
Dim rowTrack As Double
Dim modComp As String
Range("K2:N17914").Select
Set modRng = Selection
rowTrack = 2
For Each cell In modRng
If rowTrack = cell.row Then
If i = 0 And IsEmpty(cell.Value) = False Then
modComp = cell.Value
Else
End If
If i = 1 And IsEmpty(cell.Value) = False Then
modComp = modComp & "," & cell.Value
Else
End If
If i = 2 And IsEmpty(cell.Value) = False Then
modComp = modComp & "," & cell.Value
Else
End If
If i = 3 And IsEmpty(cell.Value) = False Then
modComp = modComp & "," & cell.Value
Else
End If
i = i + 1
Else
i = 0
rowTrack = cell.row
modComp = ""
End If
Next cell
End Function

Answer 1

It's not clear exactly what you're trying to achieve, but maybe something more like this would be a good start:
Function Modifer_Analysis()
Dim cell As Range, rw As Range
Dim modComp As String, sep As String
'loop over rows
For Each rw In Range("K2:N17914").Rows 'needs a worksheet qualifier here
modComp = ""
sep = ""
For Each cell In rw.Cells
'loop over cells in row
If Len(cell.Value) > 0 Then
modComp = modComp & sep & cell.Value
sep = ","
End If
Next cell
Next rw
End Function