You’re getting multiple curves due to the nature of your wall joins and an other wall which touches that space. You should look at this post for a possible solution and also read @Konrad_K_Sobon explanation which is more detailed than mine:
You’re getting multiple curves due to the nature of your wall joins and an other wall which touches that space. You should look at this post for a possible solution and also read @Konrad_K_Sobon explanation which is more detailed than mine: