Sometimes I get intrigued by strange things like this, so I tried it myself. Created a Lolth-sworn drow rogue and multiclass it to cleric at lvl 2.
Indeed, I get only one choice for God, which is Lolth. Which kind of makes sense. I do notice that on the right pane, Selune is mentioned. But his is before I accept the level up.
After I accept the level up, Lolth is my Goddess.
Should be good, right ?