Ah, I figured out what kind of bug that is. It’s actually kind of funny, and I even vaguely remember when it shows up — though I forgot the exact moment. I’ll try to fix it.
If you’ve already played through everything that’s currently in the game, then it’s not really a critical bug, since in the next update I’ll be redoing all the early-game graphics and expanding the beginning of the story — so you’ll have to start over anyway. Sorry about that, but that’s how it is. And thanks for pointing out the bug — I’ll try to fix it.