Not all sites showing in hub

I am noticing that sites hosted on GoDaddy Managed WordPress secured with the Securi WAF, tend to disappear from the hub. I will then need to log in to the WP-Admin page manualy to trigger the website to re-appear. The website http://www.dks.org.mt and http://www.protonitservices.com exibit this symptom, can you kindly advise.