You'd not expect this insecurity here!

SRI hashes missing: https://sritest.io/#report/a505e9ef-67ea-4ff7-ba89-ab28da86383c
Retirable jQuery libraries, and that medium insecurity exactly here: http://retire.insecurity.today/#!/scan/7620cde3f8cd43b3245a9f22a752f623fdabd7a7fcf723b809947cfdf7ae5490
Bad zone for this sub-domain (scr whitelisted?) Certificate - Warnings
Root installed on the server.
For best practices, remove the self-signed root from the server.

Normal CloudFlare glitches and issues, but also: Warnings for Duplicates
WARNING: MX records duplicates (same IP address):
173.194.222.26: [-alt1.aspmx.l.google.com. -aspmx2.googlemail.com.]
2404:6800:4003:c02::1a: [-alt2.aspmx.l.google.com. -aspmx3.googlemail.com.]
74.125.68.26: [-alt2.aspmx.l.google.com.-aspmx3.googlemail.com.]
Although technically valid, duplicate MX records have no benefits and can cause confusion.
Warning: Your SOA serial number is: 2021702404. This can be ok if you know what you are doing.

NetDNA-cache/2.2 exploit has a cache managing issue!
-http://b.gtld-servers.net/ open to DNS hijacking: →
https://forum.directadmin.com/archive/index.php/t-43533.html

0-type XSS: http://www.domxssscanner.com/scan?url=https%3A%2F%2Fcode.jquery.com
Especially on that retirable library: Results from scanning URL: -https://code.jquery.com/jquery-1.11.3.js
Number of sources found: 115
Number of sinks found: 94

polonus (volunteer website security analyst and website error-hunter)

P.S. Those into ad-blocking block adzerk dot net from there…

D

Update:
https://certificatedetails.com/5379bf5aaa2b4acf5480e1d89bc09df2b20366cb/5e4dc3b9438ab3b8597cba6a19850e3/gandistandardsslca2 and https://certificate.revocationcheck.com/hotjar.com
for script on www.ad.nl → http://www.domxssscanner.com/scan?url=http%3A%2F%2Fstatic.hotjar.com%2Fc%2Fhotjar-255489.js%3Fsv%3D5
-http://static.hotjar.com/c/hotjar-255489.js?sv=5
→ *.hotjar.com
verleend door: Gandi Standard SSL CA2

from server type: NetDNA-cache/2.2 with the known leverage browser caching exploit, revocation method platform dependant…

polonus (volunteer website security analyst and website error-hunter)