IE 11. All of the multi-line fields are plain text. I have tried it in IE 11 and Chrome with the same results. In the photos attached, it shows that when a single value is already in the selected field and there are no additional options to choose from, it causes the red box, which also removes all selected choices from the following field(even though there is a value in the multiline text field in the list itself, just not showing in the debug field).
If there are two values in the selected box, and no values left to select from, it seems to work as intended.