Is it possible to share a very small sample workbook showing this? Can you share what type of data sources are in use. Parameters are not tied to either data source so I wouldn't think such an issue would occur if the title is using just a parameter to identify a selected date.
Katie - knowing the Tableau version in use will help a bunch here too as there may have been a defect related to this in an older version.
Thank you for the response. I am working with Tableau 10.1.2.
It is the fact that the dates are not attached to either data source is what is causing the error. Because of this, Tableau is unable to know what was selected in the API and only shows the default dates used to create the parameter.
I work with secure client data, so I'm not sure how to share my workbook with you without it being connected to our data source.