Not just you. Its most likely the majority of the DevForum users. See this bug report post.
It’s fixed now for me atleast,
It could be like a glitch or the internet/system is down I don’t know.
i just found out that “much worse” is being able to download the user’s data and see their ips as well lol
Well, luckily my ip address didnt even get my city correct.
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You still don’t seem to understand the issue that happened. People were not logged into other people’s accounts.
If someone visited the devforum, any GET request could be cached only if that user themselves triggered that request. If any other user subsequently did a GET on the same URL, they may have gotten the cached content of the first user.
It wasn’t possible to freely browse the forum and all user info as another user. The user themselves would have had to trigger the cache to take effect on all of the pages (by explicitly visiting them).
I don’t think “downloading user data” is a single GET, you fire a POST to trigger the workload and then it is sent to you later for download. So it’s impossible for this to have been affected by the cache issue, since you weren’t actually logged in as the user.
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I logged out just a moment ago then logged back in again, and this happened to me until I logged out and back in again.
As the creator of this bug report, I’m going to mark it as solved and ask DET to lock it since this bug report is no longer relevant.
Given the information in the thread, you can fix this bug why logging out and logging back in and that the cause of this bug is the outage. 
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