Losing pitcher bug

[Cipster]

I am sure there are things higher on the priority list but there is a bug as to whom gets the loss in a game.
This is in the Mogul Enthusiasts' League. Mariano Rivera has yet to give up a run but he has a 0-1 record because he gave up a single in the bottom of the 9th. None of the runners were his responsibilily. Behold the play by play:

BOTTOM OF THE NINTH
Ben Petrick singled through the hole.
Jimmy Rollins grounded to the pitcher.
Bob Ray laid down a sacrifice bunt to the catcher.
Jose Ortiz was intentionally walked.
Mariano Rivera came in to pitch for the Yankees.
Ben Grieve singled through the hole, scoring a run.

The previous pitcher should have gotten the loss.

[playshogi]

BOTTOM OF THE NINTH
Barry Angelico popped up to the catcher.
Nijel Chandler singled down the first base line.
Bruno Mac walked.
Trevor McNabb singled to left, scoring a run.
Alejandro Thai came in to pitch for the Blue Stars.
Kimberley Carras laid down a sacrifice bunt to the catcher - a run scored.

BROWNS WIN: 2-1

The game was tied when Thai came in, but he is not responsible for the runner on base.