[Xymon] SSL test wrong certificate

We use Xymon for testing a couple SSL certificates. For most of our pages, the test shows the right certificate, but for 4-5 pages, the test shows the localhost at localdomain certificate. For sure, if we check the page online, it uses the correct certificate.

Any idea, why this happen only just for some of the pages?

The host.conf entry looks same for all pages.

XXX.XXX.XXX.XXX https://mypage.com

Maik