The included puzzle "Mobile Phone" is in the section "Hard". It is should in the section "Very Easy"
Indeed, the puzzle is in the wrong section.
A possibly relevant merge request was started @ https://invent.kde.org/games/picmi/-/merge_requests/5
Git commit 8ed719aeb4dacfc32f6b0a64102f3c98d261fc9a by Martin Walch. Committed on 08/02/2022 at 23:20. Pushed by aacid into branch 'master'. Fix difficulty of mobile phone level: "very easy" instead of "hard" The board "mobile phone" is easy to solve. Set the difficulty accordingly. M +4 -4 levels/default.xml https://invent.kde.org/games/picmi/commit/8ed719aeb4dacfc32f6b0a64102f3c98d261fc9a