I didn't lose any silver through this, but I know someone else that had this problem. I figured this needed to be pointed out.

A female goes and breed with another person's male (not through breeding offers) and the messages says something confusing like they are asking them to pay. I had a message like that myself but didn't accept it. 

It could be a bug or intentional, but it seems rather strange when I am paying the mare's owner the fee when it should be the other way around. 

This was made intentional, but you're right, there's something wrong in this logic :) Now the female owner will always pay the stud fee to the male owner. Thanks for pointing this.