opepyxl not counting rows in spreadsheets?

[jjartus]

I have checked and recheked the operation, and I stand by what I wrote. There is no possibility of error. I have 3 windows open in my screen: the 2 excel files, and the Pyscripter window. I created the first excel file, and saved it. Then saved it 'save as' with a new name that differs from the first one just in one character. Then I perform the 2 delete operations in parallel in both files and save both files. Then I run the script in both files. What I have now in my screen is 2 visually identical files with a different row count in python. I also saved the wrong file 3 more times just for if this could force to empty a memory caché; to no avail.No mistake possible.
The only correction I make is the excel version I have: 2016, not 2006.
Thanks for your interest.