To be honest, I haven't spent much time on this game and I don't remember so much of it either. It was probably some years ago I added the game-info for this game; http://s64.emuunlim.com/gameinfos/microleaguebaseball/microleaguebaseball.htm
And what I can see from that I didn't have the problem you are describing. The screenshots are taken from the downloadable image on Stadium64. Before you start the game you have some selections you can make and you might have chosen a selection that makes the game go weird. Try to choose something different. I don't know if it helps. If you still having problems, please respond!