You can see from the first two images that the creature is stuck sideways for more than one move.
The image remains sideways when you zoom (as seen in the third image).
The bug seems to occur when a transform creature merges with another transform creature. In this case, where the merged creature has reach, causing it to be in the first creature position. As seen in the third example, there was no creature with reach and the sideways creature was in the first position, while the hydra in the second position was unaffected. In this case, I don’t recall if there was a third creature on the board.
