My level keep on create a move able character out of thin air.

I’m not sure what I did but at first, my character keep on floating on the air whenever I play the level.

Later I try to delete all the character and press play, the level just generate a new character from where I place my camera on the screen.

Does anyone experienced this before?

it is probably the default pawn in your Gamemode. It spawns at player start location when you hit play.
If your character keeps floating check the settings in the movement component.