code give me correct result on jupyter notebook but didn't get correct result on knime

In my dataset, the granularity plays a crucial role, and I am attempting to In my dataset, the granularity plays a crucial role, and I am attempting to eliminate null values at the end of each column for every granularity. However, the code I executed in KNIME not only removes the null values but also alters the shape of the data for each granularity, resulting in consistent lengths. For example, if the first granularity has 20 non-null rows and another granularity has 25 non-null rows, the code should ideally maintain 20 non-null rows for both granularities, yet it inadvertently alters the data shape