Enter doesn't work in Quick search with button outside the box

In order to overcome the problem with Quick search string includes double quote [#LGX-908-69718], we moved to the option with Search button (magnifier) outside the box.
Now we have another problem: searching any existing string with Enter (not magnifier) results nothing!
Please try it on http://webhilla.890m.com/demo/grid_items_list/ . just copy and past any string and click Enter.
Please confirm

What does " results nothing!" means ?

I tried and seems like is doing something, I just don’t know if is filtering or not, but reacts to enter and clicking on magnifier.

Wich browser are you using?