Uni rejected the offer then changed to conditional offer for postgrad?

Is it impossible or just uncommon(but possible) that initially applicant got rejected and then the application changed to conditional offer?

Or it is just technical issue that last year I got rejected and this year the system was shown missed information?

Or it happened sometimes? If my first degree was difficult to interpret if it met eligible criteria. And I also have very strong relevant work experience.

I just started wondering about it after I got it for months and I’ve been preparing every tough things including statement, english, and scholarship. Very stress rn if they can take the offer back after I already preparing hard and already meet all requirements now.

It's not entirely clear what happened. Are you saying you applied for a PG course this year, and first you were told you were rejected, and then that answer changed to conditional offer, without any additional information from you?

In which case, administrative errors do happen, and you should contact the university and check.

What happened last year is irrelevant. Application cohorts change.

Yes. I didn’t send any further docs. And it’s been 2 months since I got condition offer.

Then you can check with them directly, or just accept and fulfil your offer. If you think there was an error, all you can do is check with them.