We had sprints with the exact same name on different projects. Our sprints were getting mixed up and when we closed one sprint it also closed the other person's sprint. I could see on PROJECT A's board that they had PROJECT B stories in their sprint list.
I guess you don't have two sprints with the same name but one. Sprints don't belong to a single projekt or board and can be used thorough multiple projects.
To be sure, can you rename one sprint?
If possible always give your sprints distinctive names to avoid any confusion with your users.
Cheers
Niklas
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