I just tested with the following setup:

• MediaWiki 1.27.4 (f581561) 16:58, 3. Mär. 2018
• PHP 5.6.33-0+deb8u1 (apache2handler)
• MySQL 5.5.59-0+deb8u1
• ContactPage 2.2 (c139343) 00:45, 18. Mai 2016
• ConfirmEdit 1.4.0 (f8c63df) 17:02, 6. Jul. 2017

I am not getting this issue with e.g.

wfLoadExtensions( [
	'ConfirmEdit',
	'ConfirmEdit/ReCaptchaNoCaptcha'
	]
);
$wgCaptchaClass = 'ReCaptchaNoCaptcha';
$wgReCaptchaSiteKey = 'xxx';
$wgReCaptchaSecretKey = 'yyy';
// $wgCaptchaTriggers['edit'] = true;
// $wgCaptchaTriggers['create'] = true;
$wgCaptchaTriggers['addurl'] = false;
$wgCaptchaTriggers['contactpage'] = true;

It must have been resolved in the meantime. I believe to remember that ConfirmEdit was creating multiple issues with MW 1.26 which have been fixed in the meantime. Probably this issue was one of them. Thus closing.