Hi @lilit_tsaturyan welcome to the Atlassian community.
Please be informed, I don't see any active incidents related to the Sprint modification at the moment. Kindly clear the browser cache, cookies, logout and re-login to check.
If the issue persists, your first point of contact is your inhouse Jira admin OR share us the screenshots as mentioned by @Mayur Jadhav for better assistance.
Hi @lilit_tsaturyan ,
Hope you are doing well!!,
To Delete edit and delete the sprint you would need Manage Sprint Permission. Could you please check with your Project Administrator for the Permission?
It would be great if you share a screenshot so that it will help us to identify the root cause.
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