How can I prevent a calendar event from duplicating itself?

When I create a calendar event, it is duplicating itself to the next day despite the fact that the event times are specific and contained to one day. For example, I created an event for September 19, 2019. It appears in the event field for September 20 as well- same image but event details say nothing about September 20th.

Calendar Page

Check your Language and Region Settings for your site.

1. In the Home Menu, click Settings, and then click Language & Region.

2. Scroll to see Time Zone and Geography settings and make changes as necessary.

3. Click Save to publish your changes.