Often when merging multiple DataFrames you might end up with a messed up index.
One solution to this is to apply the DataFrame.reset_index() method.
Pandas will completely reset your index to a new sequential index while keeping the old index as a new column.
Here you are! You now know how to reset the index of a Pandas DataFrame.
More on DataFrames
If you want to know more about DataFrame and Pandas. Check out the other articles I wrote on the topic, just here :