Indeed the values from a sorted MultiValue Parameter when displayed with Join function appear in their order of selection since this is the order they have been added to the collection. This behavior is by design.
If it is necessary to show the chosen parameter values sorted, a sorted collection should be passed to Join function. I would suggest you to create a custom sorting function and use it to sort the values before joining them, i.e. something like:
Join("; ", CustomSort
I hope this would help.
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