I have detailed everything over on StackOverflow here.

We have our site to set the x-ua-compatible values to IE=edge;chrome=1

This works on the hundreds of other sites we host. But in IE 11 & 10 we get code injected:

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE9">
<![CDATA[<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" >]]>

There is no rhyme or reason that we can find for this issue. The same module and site versions are being used else where without the issue.

We cloned the site to a temp domain and everything worked as expected. Pointed the DNS and it no longer worked. What could be forcing this duplicate tag injection?

It is breaking our contact us forms that utilize reCaptcha.