Please clarify this for me.

[dhamby6187]

We had a situation in a softball game last week and I have been trying to find what the official rule is. There were two outs with no runners on tie game in the bottom of the 7th. The batter hit a ball to right center and the outfielder laid out and made what looked like an awesome catch. The umpire in the field called the batter out. My team, along with the batter started to walk off the field. The other team started to yell that the homeplate umpire said fair ball. He then ran from second to home scoring the winning run, while we protested with the field umpire. I have been told by a few people that this should be called a dead ball and the runner given a ground rule double due to the fact that two different umpires made two different calls. Can someone clarify this for me with an official rule or something.