Corona Vaccine Registration Blunder

Yesterday, I tried to book a slot for corona vaccine, but it turned out that someone else with my AADHAAR id has already got the vaccine. I thought that there might be some error, so I tried to register my brother's slot but it turned out that some other person has already taken the vaccine on his id too.
I don't know what is wrong, AADHAAR used to be secure and confidential but there is some bullshit going on at the vaccine drive. Has anyone else witnessed the same thing that their AADHAAR ID being used by some other or is it just a technical glitch I don't know.