Hi besafe,
I was hoping for a small snippet that isolates the problem. I don't know how your Excel File looks like.
Anyhow, I was not able to replicate your issue. You may want to have a look at my test code.
rowcol.mp4rowcol.mp4

Rumba Script code:

Sub Main
SysHide  "Timer"
Dim lRow                                                             ' Hold the last row that contains Data
Dim lCol
Dim value                                                            ' Hold the last row that contains Data
'*******************************************************************
' Bring up Excel application and open a new Workbook
'*******************************************************************
path = "C:\\tmp\\RowColSample.xlsx"                                    ' Path to Excel file
Set XLApp = CreateObject("Excel.Application")
Set XLBook = XLApp.Workbooks.Open(path)
Set XLSheet = XLBook.Worksheets("Sheet1")
XLSheet.Activate                                                    ' Activate the Worksheet
XLSheet.Application.Visible = True

'Get LastRow and Column

lastRow = XLSheet.UsedRange.Rows.Count
lastCol = XLSheet.Range("A1").CurrentRegion.Columns.Count
' Loop through all Columns

For r = 1 To lastRow

For c = 1 To lastCol
value = XLApp.Cells(r, c).Value
EMSendKey value
EMSendKey  " "
Next c
Next r

End Sub