Not sure if this is a bug or not, but 2023 Shohei Ohtani is listed as having an IP/G of 0.98. It's possible this could have no game impact at all if it is just a display issue, but in real life Shohei Ohtani didn't only throw 1 inning per game he pitched in, and if he's limited to that in the sim engine it will be very difficult for anyone to get 130ish innings out of him.