Thank you for reaching out to Atlassian Community!
Checking the details you provided, I believe that this issue is associated to a bug that happens when we copy a text from excel and paste on the "Search". So if a ticket is open and a text is pasted, it will attach an image:
Please, click on "This affects my team" and also watch to receive updates about the bug.
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event