Duolingo XP and day streak not recording
I've been doing Duolingo every day, but occasionally, I lose my streak. And I know for a fact I've been doing Duolingo every day. I've started telling one of my friends when I finish it. He said it was weird that it didn't record.
It sometimes doesn't record when I finish strengthening a skill. The XP skills aren't recorded, even though I did finish the strengthening exercise. Usually, I'm not expecting that to happen, so I would just leave Duolingo for the day, not realizing it didn't record my XP points. I was a little disheartened when I lost my ~250 day streak. I continued to do Duolingo every day, but it's happening again and again.
Am I exiting the tab too quickly for it to record? Is it something else? This never happened to me on Google Chrome but it's happening to me on Mozilla Firefox. It might be related to that but I doubt it.