Active process instance got archived

Is anyone aware of any incident where process is still active and got archived?
We had one incident in our production today, where the process is still active at one of the sub-process node and it got archived inso we unarchived it. We are unable to comprehend this behavior.

Attached the screenshot that shows the unarchived process.

OriginalPostID-183456

OriginalPostID-183456

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