Hmm,
I reviewed my theme (Twenty Fifteen) Header and it does not have code like you reference above. I also downloaded and installed a plug-in from someone I know that was supposed to fix the jQuery issue but that didn’t help either.
I am currently running a plug-in page builder called InstaBuilder 2.0 so this overrides the Twenty Fifteen theme.
Any other suggestions because I’m out of ideas expect to submit a support ticket again to InstaBuilder.