I added a line that fixed it.
meta http-equiv="X-UA-Compatible" content="IE=Edge"
This fixed the issue, and though we both thought it was a cache issue, it was something totally different. Apparently, there is a feature (if you wanna call it that) in IE that forces compatibility mode for webpages that are detected on the same intranet (subnet) as the computer you are using. You can uncheck the option locally, but that only fixes the individual computer, and doesn't provide a permanent fix. The line of code I used above corrected everything, and forced compatibility to be disabled. That may not be the cleanest fix, but indeed it did take care of the problem. All of the computers that had issues before are no longer seeing them, and compatibility mode is grayed out when trying to view the page in IE.
The page is rendering properly on all browsers, intranet or not. Thank you again!