Unusual action whilst browsing server

I uploaded a photo to the server and while I was in there, I wanted to delete some photos. Each time I did, it told me I was no longer logged in. See attached

To be clear, I was logged in as a member with the rights to edit. After closing the attached window I was able to go back into the server and either delete another or choose a photo. That window shouldn't appear. Would you agree?

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