Does the HAR1 gene disprove Evolution?

It is hypothesized that Humans and Chimps share a common ancestor that lived 6 million years ago. Likewise it is believed that the common ancestor of Chimp and Chicken lived 300 million years ago. The difference of the HAR-1 gene between Human and Chimps consists of 18 base pairs and the difference between Chimp... show more It is hypothesized that Humans and Chimps share a common ancestor that lived 6 million years ago. Likewise it is believed that the common ancestor of Chimp and Chicken lived 300 million years ago. The difference of the HAR-1 gene between Human and Chimps consists of 18 base pairs and the difference between Chimp and Chicken consists of only 2 base pairs. The question is, "How can so many base pair substitutions(18 in all) occur between Human and Chimp in 6 million years but only 2 base pair substitutions occur between Chimp and Chicken in 300 million years?
Update: Nimrod - How do you explain 18 single nucleotide polymorphisms in 6 million years via natural selection at a mutation rate of 10^-3 per site per million years?
Update 2: The problem I see with this as it relates to biological evolution is that not only does it exceed the predicted mutation rate but it also greatly exceeds the acceptable rate for genetic load. I do not see how this gene (or the 48 others like it) can be the result of mutations.
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