No captions with random question slides

This might just be an obscure bug in Captivate 8...

I'm experimenting with random question slides, and my test works fine locally but when i upload it to our LMS no success/failure captions appear after a question has been submitted (everything else works fine). Everything seems to be right settings wise but the captions only appear when the slides are loaded locally. Has anyone any idea what could be going wrong here?