Conditional dropdown independence

[School_Bus]

I’m trying to create a conditional dropdown and it sort of works. Here is the what I have Route, Pick Up Location, Drop Off Location

So I can set the Route, and that limits Pick Up location, but I am unable to select my Drop Off Location without selecting my pick up location.

I’d like to select Pick Up Location or Drop Off location independently so that my user can use both to filter or one to filter. However it seems to all be linked and I can’t unlink it.

Any ideas? The only think I’m doing is using the validif field, and appsheet is setting up the conditional drop downs by itself from there.