In the realms menu, go to configure a realm, then go into settings at the top.

Click in the "Realm name" edit box to focus it. It highlights white and a blinking cursor is placed in it. Now click in the "Realm description" edit box to focus it. It highlights and gains a cursor, while the "Realm name" box loses focus. This is correct.

While the "Realm description" box is highlighted, select the "Realm name" box again. The "Realm description" box doesn't visually lose focus, but the "Realm name" box gains focus, so both boxes are highlighted have cursors, even though typing only affects one of them. The "Realm description" box should lose focus.