You’re right! I knew I had done something like that, just couldn’t find out where or what.
I have trouble with the In multiple selected values for lookup filters, especially when it comes to Record Types. I found I had to create a model for each of the lists of values I wanted. Maybe it works better now.
The way I did it was create two different Record Type Models, each with Name In the values I wanted, and then on the two different Record Type fields on my field editor, I have lookup filters where ID is in the values from RecordTypesModel#1 or RecordTypesModel#2, and then I conditionally render each of those fields based on user profile. 
