Please help.

I think you should clear up this and it will most likely be ok.

https://validator.w3.org/check?verbose=1&uri=http%3a%2f%2fdev.montaguelawyer.com%2f

So, basically do exactly as instructed and it should fix the issues?
If this is PHP, how do I fix, “Line 2, Column 1: Wrong xmlns attribute for element html. The value should be: https://www.w3.org/1999/xhtml” and several other errors?

Most validation problems come from plugin, widgets, themes, etc. And many of the errors are not serious ones.

Have you tried:
– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).
– switching to the Twenty Ten theme to rule out any theme-specific problems.
– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

After replacing the old CSS, I concluded that something in the CSS is causing it to do it. Question is, what part of the CSS is and why is it displaying like that in I.E.?

IE you can use webtools (they come with IE) and in FF you can use Firebut (an add-on) to identify objects on your page, the css that influences them and other neat things.

I found it without even having to debug. I was able to get the text to display at the top.

Two problems remaining:
White padding line at the top (source of problem)
and the navigation bar onIE9