After looking into this, we believe that we had already done modifications to the text to make sure everything was clear. So in the end, we did not change anything on that side. I think lots of players read tutorials a bit too quickly and miss important information as a result. We can't blame anyone. That's human nature to want to be playing immediately rather than reading.
We however corrected the bug that made "Undefined" appear on screen. This was a result of HexRoller implementation. Some extra details (in case of challenge failures) are provided in HexRoller. But this was not reflected in the Raging Bulls implementation which partially uses the same code (for challenges).
So thanks for pointing out the issue!
Have fun and Merry Christmas!