Nemesis out come was different than what dropped

I empowered my belt and the out come was not bad I thought. So I challenged the nemesis got it dropped then once im safe look at it and its some comepletely different out come. I wish I took a screenshot but its the first time this happened so im at a loss for words. It went from hybrid health t5 to poison damage t3. its not that big of a deal but man it got my hopes up.
I only have a screenshot of the end item, but dont know how to post it here.