What Is Ums_tooltip And Why Is It Preventing Classic Asp Pages From Rendering

I have a classic ASP page that's working fine on the web. But locally I'm seeing only the header when I inspect element and in the body, which is weird, I see the following being r

Solution 1:

As far as I can tell, this problem is caused by browser extension problems, not by failing to close a tag. The solution I found was to turn off the Trend Micro antivirus extension, which caused this error for one of my clients.