Check it at sitemeer.com/#https://www.finbit.org/accounts/test. Except for one 403 (which is a bit weird but I attribute to the security layer) you get all 302s.
$ curl -I -H "User-agent: Mozilla/5.0 (Windows NT 6.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0" https://www.finbit.org/accounts/test
date: Sun, 15 Dec 2019 00:18:24 GMT
cache-control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
expires: Thu, 01 Jan 1970 00:00:01 GMT
expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
Did you make sure it is not a DNS issue and you actually go through Cloudflare?
Whats the output of these commands?