Filter condition not working as intented in process flow

Hi all,

I am running into a problem with a filter that is being filled within a process flow. The flow fills the ‘dossiernummer’ from a previous screen. This 'dossiernummer’ needs to be used to filter out that specific 'dossiernummer’ in the next screen. 

Filling the filter column works perfectly, however the filter condition does not seems to reflect the actual filtering. In the image below you can see that instead of 'not equal to’ the filter seems to use the filter condition 'equal to’. Has anyone else encountered this problem?