Link from custom field – issue in Chrome on mobile devices

I use the below function for cross-linking separate pages from different wordpress instalations (a bilingual site):

The below codes are in mirror on both sites:

in functions.php:

function BilingualLink($post_id, $linktext = "en", $beforelink = "<p id='lang_link'>", $afterlink = "</p>", $defaulturl = "https://www.mydomain.com/", $linktitle = "English", $doecho = false)
{
	$otherlangurl = get_post_meta($post_id, "Alt_Lang_ID", true);
	if ($otherlangurl != '' && (is_single() || is_page()))
	{
		$langlink = $beforelink . '<a href="'. $defaulturl . '' . $otherlangurl . '" title="' . $linktitle . '">' . $linktext . '</a>' . $afterlink;
	}
	elseif ((is_category() || is_day() || is_month() || is_year() || is_tag() || is_author()) && !(is_home() || is_front_page() || is_tax() || is_search()))
	{
		$langlink = $beforelink . '<a href="'. $defaulturl . 'news/" title="' . $linktitle . '">' . $linktext . '</a>' . $afterlink;
	}
	elseif (is_tax())
	{
		$langlink = $beforelink . '<a href="'. $defaulturl . 'mycustomfield" title="' . $linktitle . '">' . $linktext . '</a>' . $afterlink;
	}
	else {
		$langlink = $beforelink . '<a href="' . $defaulturl . '" title="' . $linktitle . '">' . $linktext . '</a>' . $afterlink;
	}
	if ($doecho) {
		echo ($langlink);
	} else {
		return $langlink;
	}
}

in header.php:

<?php // Bilingual Link
if ( function_exists( 'BilingualLink' ) ) :
echo BilingualLink( $post->ID, 'en', '<p id="lang_link">', '</p>'); endif;?>

It works like a charm on PC/MAC, in different browsers, but in Google Chrome on mobile devices (tested on Ipad/Android) the link is not loaded, but only if I check the “Request Desktop Site”. (The site does not have a mobile theme).

Any idea how to solve this issue?