Trouble updating ax2 chart using a callback from ax1

[TomaszKot2]

I would like to create daily candlestick chart on ax.
When I click on a candle, I would like to see on ax2 15-minute candles for that specific day (only).
I have appropriate df1 and df2 prepared with daily and M15 data.

What I tried:

ax, ax2 = fplt.create_plot('Chart', rows=2)
ax2.decouple()
fplt.candlestick_ochl(df1[['DateAndTime', 'Open', 'Close', 'High', 'Low']], ax=ax)
live_plot = fplt.live()
fplt.set_mouse_callback(on_click, ax=ax, when='lclick')
fplt.show()

# I defined on_click function for managing callback:

def on_click(response1, response2):
    # First I am taking datestamp from mouse callback and get M15 database filtered for that specific day. 
    # I checked and filtered data is correct. Afterwards:

    df_filtered = df2[df2['<DATE_ONLY>'] == selected_date]
    # ax2.reset()
    # I tried with and without the above reset
    live_plot.candlestick_ochl(df_filtered[['DateAndTime', 'Open', 'Close', 'High', 'Low']], ax=ax2)

However it doesn't work for me. On ax2 there are only red candle bodies appearing, with infinite height (looking like a barcode), instead of a valid candlestick chart.
May I ask you to point into the right direction?

[TomaszKot2]

EDIT: Resetting the index solved it.
df_filtered.reset_index(inplace=True)