Hello @Efoe Adjakly,
Welcome to Atlassian Community!
The star symbol in those issues (*) means that the issues were added after the beginning of the sprint, as described in the "Understanding the Sprint report" section of this documentation:
Issues added after the sprint starts are indicated with an asterisk.
This feature is used to better display for you the amount of work that was not initially planned for that Sprint.
Let me know if you still have any questions about this.
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