I need some help with understanding the desync thing going on rn, what does it do?

I am asking because I just had a whole group of survivors go against me as freddy and as I hooked the second to last survivor, I saw claudette getting into a locker too late (I could see her get in there). Her excuse was that she already had the b

However, when I got to the endgame chat they started insulting me saying I was cheating with wall hacks because they were spectating the Claudette and she was apparently fully in the locker when I hooked the Cheryl.

All I know is that the desync stuff makes survivors see pretty laggy or weird hits. Does it make survivors see differently than killers by a lot?

I am worried I will get banned when I wasn't cheating, and they all seemed to agree that I used "wall hacks".

The one fricking time I decided not to record, of course.