Pressing Enter in the URL bar without changing it sometimes load another URL
I unfortunately don't know how to reproduce it, but sometime if you focus the URL bar and press Enter to refresh the page, another URL will replace the current one and be loaded. It seems like that URL comes from a previously closed page.
It's hard for me to come with explanations as of why it happens as I don't know these part of the codebase well enough and it's hard to reproduce.