Hi Ruta,
I’m sorry that you’re running into this issue…I just tested it out on my end, but I was not able to recreate this issue. Are any of the other filters returning incorrect results, or just the end date?
I would recommend running through these steps to check for any conflicts that might be happening with your theme or another plugin on your site. Please make sure to have WP_DEBUG enabled during testing and copy/paste any errors that you see into your reply. If you don’t have a testing site already, the WP Staging plugin will let you create a quick copy of your live site that you can use for testing.
Please let me know what you find!