I don't know if I'd consider this a bug. It sounds like something that only changed a few days ago because of a browser update (Chrome updates automatically) and so it's probably related to the browser's back button more than Subeta's website. Also, we have a link on the page that says "Back to Training" which should work fine for taking you back to the training page after you finish a lesson. Since this is most likely browser-related, and we do provide a "Go Back" link of our own, I won't be looking into this unless more significant problems pop up.