Hello! This is a warning to tell that depending of what you've done, you could get a bad end from moving forward. You should save and try it anyway. If you get the bad end, you will be able to reload with some info on what went wrong :D And if you don't get it, then everything is fine!
Hello! I've got the issue. The max number of horse that can be captured is one, but when winning against one, the default text was 2 instead of being dynamically displayed, leading to this issue. For release 1.9 it will be fixed (dynamic display depending of the max number properly, plus increasing the max number to 3).
Thanks for the bug report!