I would say that you don't need to have something obviously persistent, such as another bar saying 'Showing 43 results for 5 filters'. If you let the user know what you are doing behind the scenes at each stage, I think they will likely be happy with where they are in their search journey.
To achieve this, a nice big overlay with a big green tick, picking up whatever animation you are using elsewhere, and something like 'Applying filter: Februari 2017' for a second, should do the job.
A count of filters for each section would also be of benefit, for the amount of space they take up, so you top section could read 'Startmoment (1) v' - the brackets there implying a circle or other graphic to separate the count from the title.
A little bit of testing would go a long way here - put a couple of different designs or prototypes in front of users; see what they say.
EDIT: please note that I am not suggesting a 'loading' icon, which would mean that your search function would have to be slow in order for users to understand what is happening! Rather, this a message from you to your users, that appears regardless of how fast your search is.
