Under what circumstances would Miro's board history display inaccuracies?

I had an extremely unfortunate day when submitting my assignment on Miro. The website encountered issues, and it took me over 20 minutes to successfully load it. However, the instructor suspected that all the content I submitted was written today. To my surprise, content completed several weeks ago is inexplicably shown as completed today in the "board history." This has led to an unjust accusation. Can you please explain what could cause such a situation? I renamed the files before sharing the link; could that be the reason?