Heya! The mini-game can be difficult if your strength score is low. What strength did you have?
3/3 for all skills except combat and magic. I checked again and worked 6 more days to be sure it was maxed out, and it wasn't just a display error (happened to me in annother RPGmaker game, where a skill was showing up as lvl 7, although i was lvl13, so i thought it might be that, but it wasn't) so, yes, i have lvl 3 strength.