Note: I'm using Windows 7, Google Chrome as the default browser. We also don't have dedicated IPs in my country
I was trying to register online to the fall semester online through the website of my university. I sign in, and the website says Hello Fischer, so I am indeed logged in to my account.
However, when I go to the registration page, it shows me the courses and the registration status of another student that i don't know - same university, different campus, and he's living in another city so he's not using the same ISP as me.
I thought it will be fixed by clearing the cache, so I opened an incognito tab. However, I still had the same issue. I tried it in my mobile, but no luck. Even my brother has the same issue - logging to his account from his laptop or mobile.
I told my brother to contact the IT guys at my university. He said the issue is caused by our ISP. So, I asked my neighbor for help, and he let me use his internet, on different ISP. This time, the issue was solved.
I reconnected to my ISP, and out of desperation, I did
ipconfig /flushdns ipconfig /release ipconfig /renew
It seemed to work at first, but this time, it showed me the courses and the registration statues of some other student, not the one I described above!
It's really the weirdest issue I have faced! So weird, I don't know what title I should use for my question, nor what tags to use! I simply don't know how to describe it!