Accepted meetings goes directly to Deleted items folder

1) In Outlook desktop client, click File > Options > Mail;

2) In Send messages section, uncheck "Delete meeting requests and notifications from Inbox after responding";

3) In Tracking section, uncheck "Automatically process meeting requests and responses to meeting requests and polls" and "After updating tracking, and then delete responses that don't contain comments";

4) Click OK to save your changes and restart your Outlook to check it.