Can you please try getting the value of the dynamic field in the temp[late code-behind. SInce the Dynamic modules metafields cannot be resolved on the fly with Eval syntax, it is normal for the expression to return the type of the field but not the actual selected value. However you can easily obtain it in the codebehind using our extension method GetValue, for example you can say MyDynamicModule.GetValue("BoothSize").
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