Question
we had to dig up our septic cover and put the dirt back my husband say that something was growing so we let it be. Sunflowers started growing all was normal except one. It is four and half feet tall and has six sunflowers as a head and at every leaf there is another flower bud. love to send you a picture please send me a link to send it.  

Answer
Sometimes hybrid sunflower seeds tend to mutate and create unexpected results, such as reverting back to the wild sunflower which has multiple heads. This can also happen if exposed to growth regular herbicides.

Here is a link to one of the 60 original wild sunflowers:
http://www.all-creatures.org/picb/wfshl-sunflower-wild-04.html

Yours may look different because it is a hyrbid (mix between two different cultivars).