TIDY vs W3C validator

PJM <[email protected]>
Newsgroups gmane.comp.web.html-tidy.user
Message-ID <[email protected]>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>TEST</title>
</head>
<body>
<div>
 <italic>T<sub>c</sub> <italic>m</italic></italic>K and</div>
</body>
</html>

The above (note had to change i tags in order to post message) validates
fine in W3C validator.

However, Tidy, returns this:
tidy -asxhtml -wrap 0 -numeric

line 8 column 2 - Warning:  is probably intended as 
line 8 column 39 - Warning: discarding unexpected 
line 8 column 44 - Warning: discarding unexpected 

Why the difference?
P.S. Are nested italic tags valid xhtml strict? 

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