SSRS Parameter Selection disappear - sql

Hoping someone can help. I am very confused. I have a client working on SSRS (SQL Server 2014). We have reports running and they ran fine in the past. Since about a week ago when selecting a specific parameter and clicking on view report, the selection in the parameter field reverts to nothing. It seems to happen almost immediately without querying the data.
There are multiple reports with the same parameter and they have the same issue, letting me to believe it is a data issue, but I can't see anything that might be wrong in the data.
If you have any advice I would highly appreciate it.
The DataSet for Sites:
Select SiteName from Sites
Order by SiteName
Its a very basic query. Nothing strange...

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Regards,
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I will have to rethink of how to use the date parameter on the PRD reports.
I am going to post a new question on how to include a working date parameter on PRD and link it to this question.
In the meantime, I will consider this a closed issue.

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