Randomizer not working?

Hi all,

I'm making a survey for my dissertation. The survey will entail a participant being allocated to one of four vignettes randomly, and then filling out a set of questions. I've tried setting up the randomizer by using embedded data as shown below:

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But for some reason on my test responses it solely allocates participants to Condition 4. How do I go about resolving this?

Thanks
Becky