They recently changed the numbers of lessons needed to do a skill on the web version. Or it may be an A/B test. I think you answer more questions in each, but the app still has the old number. It works anyway so don't worry.

I see from the image of the web site for Adjectives 1 that their is 8 lessons indicated. But how many lessons are shown when you enter the Adjectives 1 skill? Is it just the count that is incorrect on the home page or are you missing one lesson completely?

PS on my system there are 9 lessons in the Spanish Adjectives skill on both the web interface and the iOS App.