Huh. That's really strange. It sounds like, for some reason, only the displayed resource count was changed, but not the actual inventory. Were you using CheatEngine? This can happen if you change the number in the UI instead of the actual resource variable.
Good thought, but I was not. I was playing the game just as downloaded. If it is relevant I am on an m1 mac mini 16GB RAM, running off an external SSD. At first I suspected some kind of rollover bug, but even if you were using a signed 8 bit int (for some season) 119 still wouldn't roll over into negative.
I don't know if this is relevant but I also had to defeat two different bosses twice. I would get the quest to do it, go defeat them, come back deliver the item, and then a few steps later I would be told to defeat that boss again. I honestly don't remember if the dialog supported that, but it felt odd so I wanted to mention it