I too had this same problem. The issue arises from the ampersand in the link (&cpage=1) not being a proper entity reference. The & should be & .
I fixed the issue by adding the following code to functions.php:
$ret = preg_replace( '#&#', '&', $ret );
That line should be added directly after the following code (line 1213 in my functions.php):
$ret = preg_replace( '#=(&|$)#', '$1', $ret );
The causes the & to be replaced with it’s entity reference & and thus your comments feeds should render properly. Mine did.
