Export csv button saves previous run's data even after new parameters

I have a dash button that exports a .csv after clicking. The export function requires a Predict Button to be clicked first and takes in a dataframe produced after the prediction function completes.

The button works functionally but if i want to change the parameters and predict again, the export button will export the csv of the previous run first and then only if clicked again will output the correct data. The only thing that fixes this is if i refresh the page after each prediction

See code below

html.Div([dcc.Input(id=‘uplift_comment’, type=‘text’, placeholder=‘Comment’,
style={‘min-width’: ‘500px’, ‘display’: ‘inline-block’}),

          html.A(html.Button('Export CSV',id='ebutton',style={'color':'coral'}), 
                 id='export_link',
                 download='DT_'+dt.today().strftime("%m.%d.%Y")+'.csv',
                 href="",
                 target="_blank",
                   style={'width': '50px', 'display': 'inline-block','position':'relative','margin-left':'7%'}) ]

@app.callback(Output(‘export_link’,‘href’),
[Input(‘ebutton’,‘n_clicks’)],
[State(‘uplift-df’, ‘data’), #DATA FROM PREDICT FUNCTION
State(‘pbutton’,‘n_clicks’),
State(‘uplift_comment’,‘value’)]
)
def export(eclicks,pred_json,pclicks,comment):

if pclicks is None:
    return None
else:
    

    
    
    out_df = pd.read_json(pred_json, orient='split')
    timestamp=out_df['time'].drop_duplicates()

    csv_string=None
    
    
    timestamp=out_df['time'].drop_duplicates()

    df_export = out_df[out_df['DT'] > 0].copy()
    # TODO: add default project name here
    df_export['Project'] = +str(timestamp.iloc[0])
    df_export['Dur'] = '7D'
    df_export['Comment'] = ''
    

    csv_string = df_export.to_csv(index=False, encoding='utf-8')
    csv_string = "data:text/csv;charset=utf-8," + parse.quote(csv_string)

    del df_export
    return csv_string

Is this a caching issue?

I am using an older version of Python, could that be the issue?

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