Add second filter after submitting first

[aywein]

When I search for one filter and submit, if I try to add a second filter, the first filter gets [[///'//]]] and the search doesn't return any results.
See screenshot

[RitchiS99]

I am experiencing more or less the same error. If I search for something and then try to search for the second field, list symbols are added to the search maded before. So i typ in Test to "firma" and everything works fine. Now when I go the field "Standort" and press enter, firma gets ['...'] attached where the "..." is the old searched string. If i press enter again in "Standort" the same is happening, so now i have ['['Test']'] in the search field and the search isnt working anymore