RE: Php echo li-tag not seen by validator

To clarify: The page that is failing is just a regular php page which
includes some <li> tags which are printed to the page using php code,
and for some reason the validator is not seeing them (although they are
working correctly on the web page and shown correctly in the page
source).
 
Because the validator thinks there are no <li> tags within the <ul> tags
it gives an error. 
 
Thanks,
Nick