I see "Flirting has been strengthened" message after each new lesson or excercise
I bought Spanish Flirting lesson right when it become available. I finished it some time after that. Unfortunately whenever I finish unrelated lesson (yesterday's and today's Occupation lvl 2 and 3) or finish strengthening exercise I get message that I strengthened Flirting (4/5 bars I think). This is bug in desktop version (I use Chrome browser) but If I remember correctly, I finished Flirting lessons on my iPad.