Redirection on domain name

If you call $ curl -I https://glaszetterdirect.nl you can see the the response charset is UTF-8 which indicates the redirect is done by WordPress, not the webserver.

$ curl -I http://www.glaszetterdirect.nl

HTTP/1.1 301 Moved Permanently
Date: Fri, 05 Oct 2018 08:24:41 GMT
Expires: Fri, 05 Oct 2018 09:24:42 GMT
Cache-Control: max-age=3600
Location: https://glaszetterdirect.nl/wp-admin/
Content-Length: 0
Content-Type: text/html; charset=UTF-8
X-Backend: web02_vmm22
Server: PCX/Cache
Age: 2483
X-Cache-Hit: Yes
X-Cache-Hits: 3
X-Server: cache01
Connection: keep-alive

While trying to access http://www.glaszetterdirect.nl/wp-admin will redirect you to the trailingslash page with a iso-8859-1 charset.

$ curl -I http://www.glaszetterdirect.nl/wp-admin

HTTP/1.1 301 Moved Permanently
Date: Fri, 05 Oct 2018 09:10:14 GMT
Location: http://www.glaszetterdirect.nl/wp-admin/
Content-Type: text/html; charset=iso-8859-1
X-Backend: web02_vmm22
Server: PCX/No-Cache
Age: 0
X-Cache-Hit: No
X-Cache-Hits: 0
Connection: keep-alive

You should have a look into the installed plugins and custom code as suggested by @Sally CJ.

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