I am using iloc to print every third row in a Pandas Dataframe, but now when it prints to Excel, it prints starting in the fourth row (third excluding header). I want it to print starting at the first row as it normally would. I tried dropnan(), and replace(”, np.nan), but it looks like that is not the issue. Thank you for your help!

I am trying to shuffle data within the same group in a dataframe(grouping 4 columns together) using pandas and numpy as shown below.
The grouped columns are ID, values, source, type and function. I am have copied the same values from the ‘value’ column into the ‘values_new_column’ and would like to shuffle within this new column ‘values_new_column’ (image attached).
So far, I have written this code: