Q:

I'm being logged into Data Explorer as "jon.doe18", why?

Forgive me if I'm just ignorant of some well-known fact that explains this behavior:
When I log into Data Explorer with my usual OpenID provider (myOpenID), then I'm logged into the system as

http://odata.stackexchange.com/users/716

where I actually should be

http://odata.stackexchange.com/users/18771

What's going on? (And the latter URL gives a YSOD with a generic "Runtime Error" message)

A:

Your user account on Data Explorer is not tied to, and does not share its ID with, your accounts on SO/Meta. The system, though similar in appearance, is completely different, as it started life as a third-party tool

