Thank you very much for the bug report. Other players have also reported the bug. Actually I wanted to leave the game as it is, but probably I will release a little hotfix just for this bug.
I just released a little hotfix for the game: Changelog 1.3.1
The bug should be fixed now. It's somehow weird to make even small changes after a half year. This bug in particular showed me that many things could have been better designed. Everything is a learning process :)