Answers marked right no matter what they are
In some of my lessons (mostly Swedish, I think), I'll run into a problem where it marks my answers as correct even if it's very obviously not. I don't mean simple typos, but things like misspelling the word beyond recognition, entering an entirely wrong word, or even accidentally hitting enter after only one letter. It doesn't always do that, but it happens maybe once every few days. Any idea what causes this?