DFF on PO with the display type as "Inline Search" is breaking the PO page completely upon adding 2

Content

Created a DFF at Purchase Order Header called "Dept Location" and display type given as "Inline search" deployed. 

Logged into new session, created a new purchase order and added 2 lines when I add 3rd line and save it PO page breaks out completely as you can see in screenshot (attached) and freezes. At this point I have to close the browser and open it again.

If I remove the display type as Inline search and put as List of values it works fine. But our users need to have the display type as "Inline search" as the values are auto suggested in the field upon typing.