Adding links on ticket main form is limited

[trasher]

Trying to link devices on a ticket. When I use the items tab, all works well.

Using the main ticket form; you cannot add al the elements you want; it seems to be limited. This is very strange because when adding at once 8 elements, it adds 5 of them. Then, I tried to add the 3 remaining; it only adds one (and I'm not sure kept elements are the 5 initial)