I suspect this might be fixed in more recent versions of plugin, but Grace Church is still on v12 of Rock and there is no update available. To fix this you can replace this code in the \Plugins\com_mineCartStudio\Cms\LavaTPdf.ascx.cs file:
var uriBuilder = new UriBuilder( Request.Url );
var query = HttpUtility.ParseQueryString( uriBuilder.Query );
query["ViewDocument"] = "true";
uriBuilder.Query = query.ToString();
lMessages.Text += string.Format( @"<div class=""alert alert-warning"">If you did not have administrative access <a href=""{0}""> you would be shown this PDF.</a></div>", uriBuilder.ToString() );
With this code:
var queryParams = new System.Collections.Generic.Dictionary<string, string>();
queryParams.Add( "ViewDocument", "true" );
var url = GetCurrentPageUrl( queryParams );
lMessages.Text += string.Format( @"<div class=""alert alert-warning"">If you did not have administrative access <a href=""{0}""> you would be shown this PDF.</a></div>", url );