[Python] Matplotlib vertical grid lines not match points

Could you please explain why vertical grid lines not match points?



Here is my data for plot:

{datetime.datetime(2025, 4, 15, 19, 23, 50, 658000, tzinfo=datetime.timezone.utc): 68.0, datetime.datetime(2025, 4, 16, 19, 31, 1, 367000, tzinfo=datetime.timezone.utc): 72.0, datetime.datetime(2025, 4, 17, 19, 34, 21, 507000, tzinfo=datetime.timezone.utc): 75.0, datetime.datetime(2025, 4, 18, 19, 50, 28, 446000, tzinfo=datetime.timezone.utc): 80.0, datetime.datetime(2025, 4, 19, 19, 57, 15, 393000, tzinfo=datetime.timezone.utc): 78.0, datetime.datetime(2025, 4, 20, 19, 57, 49, 60000, tzinfo=datetime.timezone.utc): 77.0, datetime.datetime(2025, 4, 21, 20, 28, 51, 127710, tzinfo=datetime.timezone.utc): 73.0}

And here is my code:

fig, ax = plt.subplots(figsize=(12, 6))

ax.plot(df['Дата'], df['Вес'], marker='o', linestyle='-', color='royalblue', label='Вес')

ax.scatter(df['Дата'], df['Вес'], color='red', zorder=5)

ax.set_title('График изменения веса по дням', fontsize=16)
ax.set_xlabel('Дата', fontsize=12)
ax.set_ylabel('Вес (кг)', fontsize=12)
ax.xaxis.set_major_locator(mdates.AutoDateLocator()) # Раз в день

ax.xaxis.set_major_formatter(mdates.DateFormatter('%d.%m.%Y'))

plt.setp(ax.xaxis.get_majorticklabels(), rotation=45, ha="right")

ax.grid(True, linestyle='--', alpha=0.6)

plt.tight_layout()

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