Font names list from WYSIWYG loses its values when page saved by IE6 and IE7

Steps to reproduce:

-login
-using go to Admin Wiki -> WYSIWYG editor.
-Using IE6 or IE7, save the page
-refresh the page.

you will notice that font names changes from (as seen by Object Editor):

Andale Mono, Arial, Arial Black, Book Antiqua, Comic Sans MS, Courier New, Georgia, Helvetica, Impact, Symbol, Tahoma, Terminal, Times New Roman, Trebuchet MS, Verdana, Webdings, Wingdings

to

, , , , , , , , , , , , , , , ,

and resuling in a list without values.

Happens only on IE6 and IE7 (IE8, Chrome, FF3, FF4 work)