Alex, my apologies. The screenshot was of an edit form. However, this behavior happens in ALL forms. Fields are just regular lookup fields. I added another lookup field (Lookup2) from a different list and that doesnt seem to have an issue. From what it looks like I am only getting this error when i create lookup fields from a particular source list. Because of this error, I am not able to select any value in edit and new form with DFFS enabled.
What puzzles me is that this error does not show up in out of the box sharepoint form. And I am able to select values for this lookup field.
I have attached a gif and screenshot displaying this behavior. Let me know if you need additional data.
