[Python] Python can't sort values from GitLab export [duplicate]

I am sorting an amount of information of a GitLab-issues export and to then sort this information according to their date. Yet, when I start the script, I always get the same error:

SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead
​

data = pd.read_csv('09.csv',sep=',', header='infer')

test = data[data["Labels"].str.contains("epic", na=False)]

test = data[data["Title"].str.contains('xMS::001|iMS::000_Restart_ILASC_Implementation', na=False)]
test['Due Date']=pd.to_datetime(test['Due Date'])
test.sort_values(by=['Due Date'], ascending=True)

with pd.ExcelWriter('v34.xlsx', engine='openpyxl', mode='a',if_sheet_exists='overlay') as writer:
test.to_excel(writer, index=False, startrow= 10, startcol=1)


And even if I avoid this error, the sort in my table doesn't change, no matter how I adjust it.

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