Bash syntax highlighting inconsistent

I have a problem with Bash syntax highlighting on two different machines
using the same version of Vim. If I define a Bash function on either
machine **without** using the "function" keyword, the function
definition is highlighted green in my color scheme as expected:

some_bash_function()
{
# Stuff inside function
}

However, if I use the "function" keyword like this:

function some_bash_function()
{
# Stuff inside function
}

It's highlighted incorrectly on the Debian 8 machine but not the RedHat
6 machine. I am running the exact same version of Vim on both machines
(7.4 patch level 1796) with the exact same set of configuration files.
If I run ":scriptnames" on both hosts, the text is identical. Does
anyone have any ideas what's up with the difference in syntax
highlighting?

Thanks,
Eric

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