Problem with counters and nested for

The problem I have can be found in the following workbook:
In worksheet "tabla" there's a button called "Reporte semanal"
You can type either Agosto or Septiembre in the first inputbox, then 2015 in the second one. With "Agosto" the program runs well, but in "Septiembre" it gives some random blank rows. The problem is probably in the nested fors with the counters in the code, but I cant figure out what the problem is. Also if you have any suggestions to make what Im trying to do with my code better, feel free to tell me. It would be great.
Thanks a lot for your time!