Duolingo XP changes
Duolingo changed some XP scoring on some of its lessons. I think they introduced a bug.
New Review Lessons
In the snake, Duolingo put in these review lessons that "review words and grammar taught across levels". I think it's a marketing gimmick. This lesson 138-3 contains practice questions taught from 138-2 and 138-1, not from various lessons in the snake.
If you look at Exhibit Four you can see how to identify these lessons. They have a dumbbell but are new lessons. You have to complete them if you want to advance on the snake. What I think they do is bridge the gap between three levels on the snake and five levels on the tree. These kinds of practice used to be awarded 15 XP max since they introduced the snake in September. Exhibit 6 shows the XP stated before the lesson is +10, which usually means 10 plus 1-5 bonus. Exhibit 5 shows the lesson complete screen says 15 will be awarded.
The last 2 times I did these lessons they were awarded 5xp. See exhibit seven at 13:57:37 and exhibit one at 19:12:18.
Already completed lessons
If you practiced an already completed lesson, like I did from 21:00 to 22:00, you would get lesson complete screen like exhibit 2 if you did it on the app, and like exhibit 3 if you did it on the web. However, Duome used to add the bonus for the app lesson and the XP on the lesson complete screen would not match duome and Duo for schools.
You may not like how they fixed it, though. The same lesson worth 5XP on the app is worth 10XP on the web. We've had XP disparities before in web vs app, but Duolingo closed up a lot of those disparities in switching to the snake. I think it's a illogical solution to solving the technical problem.
Related ?
It's possible both items are related because the changes occured at the same time & they involve similar issues.
If you're doing new lessons, here is what you should do.
If you get a dumbbell lesson look at the XP promised and the XP awarded on the lesson complete screen. I'd expect anything from 11-15.
Look at what you are actually awarded in duome when finishing the lesson. I think you will see 5.
Submit a bug through the form I've linked or through the help center if the XP awarded does not equal xp promised.
If the practice thing concerns you, here is what you should do.
Pick one old lesson and do it on the app. You can choose 44-2 Make offers and requests as I did which is the old skill 3.22 at home 3 or anything you've completed.
Do the same lesson on the web. I'd expect you to find the XP on the lesson complete screen to equal the XP awarded, so it is not a bug per se, but it comes under the category of "If you think that Duolingo is not behaving as expected, we would appreciate it if you'd let us know." The XP awarded on the web is different for the same thing on the app.
My examples are fr-en but everything is supposed to work the same in all languages. Of course if you test as I've asked in your language and are not noticing these problems, don't submit a bug report. I'd also thank you personally for helping out another Duolingerer by putting in the effort to test and discover the magnitude of the issue.
My goal here is to see if others have the problem (I'm sure it can't be just me) and to get bug reports into Duo to put pressure on them to fix this.