Sunflower Surprise?

I've been anxiously waiting for the rest of my sunflowers to bloom. But now that they are blooming, they  don't look quite like I expected...

Almost a Mammoth Sunflower, August 6

August 9 bloom. The flower is a lot smaller than last year's. At first glance, I thought the flower looked nothing like the mammoths I grew before, because the center seems smaller in proportion to the rest of the flower, and the petals just looked different. But when I compared pictures, I realized the petals and center do look the way they should. 

Three almost Chianti hybrid Sunflowers, August 6

The first one bloomed yesterday...This is not a Chianti sunflower. Chiantis have dark red petals--no yellow! My baby got switched at birth!

Did a different kind of seed get slipped into the packet? Could something have happened during pollination? It's pretty, but this does not look like the Chiantis I grew last year.  This flower came from a bud (top picture) that didn't look like the other buds, which have the tell-tale purple markings of a Chianti. I'm crossing my fingers that I get my beautiful deep red flowers. In the meantime, I'll enjoy this pretty sunflower, but I'd like to know what variety it is.

I'm linking up with Fishtail Cottage's Cottage Flora weekly meme this week. Looking forward to seeing other blooms around the Internets.