Hackers?

Smurf, peekers advantage, sound: those are 3 legit that can happen often.

with last patch they fixed some bug about walls but it should be mostly the reasons on top.

there are very few cheaters in valorant atm.
their ultra invasive anti-cheat softwer is working well.
Also if u report it during game there maybe a chance that game stop and reset. (it happened to me 3 or 4 times)