Some services also report me being in Prague, Czech Republic (which is actually closer to me than Berlin), but my traffic still goes through Berlin, so even measuring round-trip times shouldn't put me that far off. Maybe similar prefixes were used by other tunnel endpoint? I have no idea. In the past I was even often located in the US, due to HE being US-based I assume.
I've seen US listed as location a while back somewhere too, figured that made sense since HE is based there (Fremont CA if I remember correctly). Also saw other countries with the geolocation services I did find, including Russia, but no countries where they speak German. So maybe Facebook itself messed up, but they do not have any support that can actually be reached. There is a way to report problems, but I've done that over half a dozen times the last two years without getting any reply from them.
Sorry I can only be anecdotal here. Adafruit.com works fine for me. Maybe you can email cloudflare?
Well, their website says
this about the problem:
Why do I see an Access Restricted Cloudflare Challenge Page?
If you are the site visitor:
The IP address you came from recently had bad activity online, so Cloudflare will present a challenge before you can access the website. Here's what you can do to solve the problem:
1. Passing the captcha will help reduce the threat score associated with the IP address. If no bad activity is seen from the IP address after a two-week period, then the challenge behavior will stop against that IP address.
2. You can also request that the particular site you're visiting whitelist your IP address when you pass the captcha and send a message to the site owner. If the site owner decides to whitelist your IP address, it does two things:
a) It allows you to access that site from that IP without further challenges for that site.
b) Helps correct false positives with IP data, which further helps reduce the threat score associated with the IP address.
Note: You must have cookies enabled to pass the captcha.
Doing captchas hasn't done anything so far (besides restoring access temporary) and not every website shows the captcha on the error page, Adafruit Industries being one of them. Since I regularly visit that website I emailed them about it and there gonna look at it. As for other pages, there are too many showing that error.
I don't see any email listed, so I guess I'll register and open up a support ticket, hopefully I can find out what's going on.
But in the mean time I still have IPv6 disabled. I'm considering creating a 2nd tunnel, hoping I end up with a different range that doesn't cause problems.