i forgot the name of the level but its in the swamp where at te end of the level u can use the AA-gun anyway why are rico luger and templar stay on the spot when i use hakha why dont they come with me is this a bug?

That always happens. There's nothing wrong with your game.

ok so why do always stay there cause when i play as rico they are coming with me if i remember right because in the start there also helghast and when i play as hakha the arent

The enemies appear at different places depending on what character you use.

ok so my other question is why they stay on spot when i play as hakha but they come with me when i play as rico dunno with templar and luger never use those

I don't remember them ever coming with me to the AA gun no matter which character I used. Maybe there actually is a glitch there then. It's not actually stopping you from advancing or anything is it?