The fighters position during the Close Combat event are based on their position when the event starts. But it is possible that the positions of the fighters were inverted before launching the event, due to lag. Therefore, the positions of the players are inverted from one screen to another.

This bug is visible here:
https://twitter.com/TxoriCom/status/1783871519392698653

It is not blocking, and the game is managing the positions pretty well when the Close Combat ends. But it would be better to have correct positions from the start.