Memory leaks on Gnostice PDF Toolkit - delphi

Question

I'm using Gnostice PDF Toolkit v5.0.0.457, and it works fine to operate with PDF files (merge files, split files, insert blank pages, insert text watermarks, insert image watermarks, print files, ...).
But I always have big memory leaks that prevent me to use it on the server side.
Am I doing something wrong in this code (it simply adds a text watermark to a PDF file) ? :
implementation
{$R *.dfm}
uses gtCstPDFDoc, gtPDFDoc;
procedure TTestForm.btnTestWatermarkClick(Sender: TObject);
var PDFDoc: TgtPDFDocument;
txtWatermark: TgtTextWatermarkTemplate;
begin
PDFDoc := TgtPDFDocument.Create(nil);
txtWatermark := TgtTextWatermarkTemplate.Create;
try
PDFDoc.LoadFromFile('C:\Temp\Test.pdf');
txtWatermark.FontEncoding := feWinAnsiEncoding ;
txtWatermark.Text := 'Hello World';
txtWatermark.Font.Name := 'Arial';
txtWatermark.Font.Size := 12;
txtWatermark.Font.Color := clBlack;
txtWatermark.X := 150;
txtWatermark.Y := 150;
txtWatermark.HorizPos := hpCustom;
txtWatermark.VertPos := vpCustom;
txtWatermark.Overlay := True;
PDFDoc.InsertWatermark(txtWatermark, '1');
PDFDoc.SaveToFile('C:\Temp\TestOutput.pdf');
finally
PDFDoc.Reset;
PDFDoc.Free;
txtWatermark.Free;
end;
end;
This simple example already generates important memory leaks.
PS: I know that the best place to get support is the manufacturer itself, but my subscription ended a year ago.
Thank you
Update: We have re-subscribed with Gnostice, and the current version has the memory leaks solved. Thanks to all.