How did I just lose 40~ XP??

Question

I have been keeping close tabs on my experience bar, trying to learn what gives experience besides challenges and completing modules. Suddenly, I lost 38 XP in my HTML skill and 9 XP in my Java skill.

I have not:
- lost any recent challenges
- reset any course progress

Anyone have a clue what's going on?

PROBLEM SOLVED
Turns out I had lost some challenges, but they weren't showing up in my challenge list, possibly because the maximum display is 100 challenges. Thanks for the input folks.

Answer 1

Did you just updated SoloLearn application? I think it happens sometimes when they change a bit their algo for xp calculations.

Answer 2

Nope, I haven't updated recently. I just checked and it looks like there is an update available (4.8) though.

Answer 3

I checked your feed and seems you have some lost challenges, so the amount of XP you lost is OK.

Answer 4

Yeah, I just figured it out. I had so many challenges pending that the ones that were recently completed weren't showing up on the challenge list for some reason.