I can’t see the titles to know this for sure, but it looks like you are referencing the same query that you are trying to get the drop down in?
You’re supposed to make a totally different query for the lookup in the drop down. Your lookup query just needs the bare minimum to get the list of things that you want to see, with an ID field and a display field, (which may or may not be the same thing depending on what you are filling in).
That drop down is not going to be aware of anything else in the query, so if you’re trying to get a filtered list based on something else, this technique won’t do that.
