Posted on the main game page:
Note, 4/18: We have identified and fixed a bug that was causing inconsistent results on some ballpark effect rolls for a number of leagues, on the nights of Saturday and Sunday, 4/16 - 4/17. We sincerely regret and apologize for this error, and have resolved the issue effective for tonight's new games (Mon, 4/18).
Doesn't say what leagues, what parks, which is unfortunate if someone misses out on a playoff chance by a game or two that may have been affected by a BPHR or two. I hope they issue more than just an apology.