revisions with blank author

I am working on the site
fitnesshealthandmind.com
At least once a day the front page becomes a partial garbled mess of what the page should be and partial code.
This is NOT a code issue.
The page works correctly. Then for NO reason it is broke. Checked in many browsers.
To fix the issue I click edit page, and then update page. When I click view page the page is back to the original. Yes that is correct I change NOTHING, just save the page and it is fixed. The code is not changed or edited.
There is always at least one if not two blank revisions authors when this happens. The revision is correct, there is no Author name by the revision
There are only two admins on this account and neither of us show up as blanks.
Who or what is creating this revision.

I have found, pulling up manual backups and comparing revisions that some things are changed in the code from what the browser has in source.
Spacing is different.
Symbols changed to their HTML equivalent.
Divs removed
The java that was on the page was broken up with <p> so I moved it to the header.

When the page is broke complete lines are missing including divs

some examples of the current page.
When it breaks again I will post specific changes for that.
These examples the page still works.

<!--end dual video -->
<!--begin insights -->
changed to
<p><!--end dual video --><br />
<!--begin insights --></p>

<h6>Sign up NOW and receive these 7 bonus PDF Tips and Tactics FREE<h6>

<img src="http://fitnesshealthandmind.com/wp-content/uploads/2011/12/350SelfHelpHeader-300x69.jpg" alt="" title="350SelfHelpHeader" width="300" height="69" class="aligncenter size-medium wp-image-63363" />
changed to
<h6>Sign up NOW and receive these 7 bonus PDF Tips and Tactics FREE<br />
<h6>
<img src="http://fitnesshealthandmind.com/wp-content/uploads/2011/12/350SelfHelpHeader-300x69.jpg" alt="" title="350SelfHelpHeader" width="300" height="69" class="aligncenter size-medium wp-image-63363" /></p>

<!--end insights -->
<!--begin tabber -->
changed to
<p><!--end insights --><br />
<!--begin tabber --></p>

/>
changed to
/></p>

<br />
added for no reason

set...
changed to
set…

The ‘&’ is often changed to the HTML, but if use the HTML then the ‘&’ in the HTML is often changed to the HTML putting bad HTML on the page for the user to read.
I could go on.

I know WP attempts to work some magic behind the scene with the page. What would make it send out garbled code or not consistently edit the HTML and add a blank author revision to the revisions?