This isn't a bug, nor is it a design decision. The game doesn't give any artificial "home field advantage" to a team in this game. As a result the homefield winning percentage should tend to be around 50% or maybe a bit above or below in OOTP, each team that plays in this game will have as good a chance at beating another team at home as it does on the road. (I really wouldn't want to see some artificial homefield advantage built in).
I don't see this as a problem, and its not even an annoyance to me.
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