Slide master timing overrides the set slide timings

Hello, Every slide in my project has a timing of 5 seconds regardless of what the slide timeline says. This 5 seconds is coming from the slide master. When I changed the slide master to 20 seconds all slides in the project changed to 20 seconds. I'm pretty sure it is not supposed to work this way.

I checked this behaviour on two different pc's version  
Storyline 3 Build 3.8.20838.0 and  
Storyline 3 Build 3.7.20003.0

Please advise