As I've written in the topic, when I press "2" on keyboard, it selects the entire party instead of just that one character. It's important to note, this problem appeared suddenly, after entering the catacombs in Defiance Bay.
Things I've tried to do to fix it: Loading a quicksave [still inside catacombs], loading an autosave [inside the catacombs, right after entering], quitting and re-launching the game, changing party members between that slot, reconfiguring keybinds, resetting them to default, and restarting my PC.
But, when I loaded an earlier save before entering the catacombs, that didn't happen. Entered the catacombs again, and it didn't happen aswell. I was out of combat when testing all of that, and without any buffs / debuffs on my party. So it's not really an issue anymore.
The problem is, that save I loaded to fix it was when I just arrived at Defiance Bay, which means I had to do everything I already did all over again