I just bought this mare from Adams Auctions. It says she's been bred this year but has no foal history. I thought all horses that came out of the auction were unbred?

Apparently it is because horses who have been bred but have had the foals deleted, they can be entered into Adams

In the game guide about Adams it says unbred horses, is that not the case?

But even if the foal was deleted there should be information in the breeding history tab. So that's a tad odd.