[Python] Why is df.fillna() only filling some rows and the first column

I am trying to fill all empty spots in rows and columns with [], however fillna() will only do some rows and the first column. My code has worked in previous runs, so I'm not sure what happened.

df = df.fillna(value = "[]")
print(df[['keywords']])
df.to_csv(r'C:\Users\user\dfexport.csv', index=False, header=True)


When looking at the CSV file, it looks like this:



The print statement looks like this:

print(df[['keywords']])




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