How to reproduce : 

1/ Create an exhaustive content and fill "Owns" field. 

2/ Create a SOLR request in ordrer to retrieve owns column. 

3/ Perform the request => It is possible to edit an exhaustive of "owns" column : 

a pop-up is opened with all columns relative to the exhaustive owns. 

If fill 2 long multiple but they are not opened but they are not printed : 

When I save and go back, it is ok, field is filled. 

The same problem appears with double multiple.