This feed does not validate. Fix

https://feedvalidator.org/check.cgi finds errors in URLs regarding GET-vars, i.e. ‘&’ ist translated incorrectly.

Fix: comment the lines

# $curl = preg_replace(‘/&([^#])(?![a-z1-4]{1,8};)/’, ‘&$1’, $curl);

in function wptexturize($text) in wp-includes\functions-formatting.php

and

# $content = preg_replace(‘/&([^#])(?![a-z1-4]{1,8};)/i’, ‘&$1’, $content);

in function convert_chars($content, $flag = ‘obsolete’) , same file

Also: it complains
This feed is valid, but may cause problems for some users. We recommend fixing these problems.

line 27, column 3: Avoid content:encoded (10 occurrences) [help]

<content:encoded><![CDATA[<TABLE border=0 cellpadding=0 cellspacing=0 ali …