It's possible that you may have witnessed a rather strange scene during your last Valorant games. A player recently discovered a new glitch on the Split map.
A temporary malfunction in Jett's Updraft ability is causing her to get stuck on the ceiling. This only happens in one of the first buildings outside the Attacker Spawn in B, as we can see in the video below.
While nothing is done to give players access to the ceiling, simply using twice the jumping ability of the dualist and holding down any movement key will get you stuck in the air. This gives a distinct advantage to Jett players who can surprise their opponents at height.
Chances are that this glitch will be corrected in the next patch that should be deployed next week. These posts on Reddit allow developers to quickly fix these bugs before the official release of the game, scheduled for this summer.