comments made on iPad get the comment_author_url removed in the pre_comment_author_url filter

[commentluv]

I have tested this on version (3.5-RC1-22909) nightly build too.

if I submit a comment with a valid author url using the iPad then the URL gets removed by the pre_comment_author_url filter in wp-includes/comment.php
works
windows 7 works fine
windows xp works fine
debian box works fine
macbook pro works fine

Not working
iphone ios 5.1.1
ipad ios 5.1.1

duplicable on local, live and someone elses site.

I can see the POST vars show all the proper data.

in wp-includes/comment.php the wp_filter_comment function the $commentdata['comment_author_url'] exists before

$commentdata['comment_author_url']   = apply_filters('pre_comment_author_url', $commentdata['comment_author_url']);

(line 1291 of wp-includes/comment.php (3.4.2)

but is gone after the filter has been applied,

this happens only if using an ipad or iphone.