diff --git a/components/tachart/demo/distance/distancedemo.lpi b/components/tachart/demo/distance/distancedemo.lpi
index b0f685174f..660e28c1ec 100644
--- a/components/tachart/demo/distance/distancedemo.lpi
+++ b/components/tachart/demo/distance/distancedemo.lpi
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <CONFIG>
   <ProjectOptions>
     <Version Value="9"/>
diff --git a/components/tachart/tafuncseries.pas b/components/tachart/tafuncseries.pas
index a1d2e9bf7b..05248ea4e8 100644
--- a/components/tachart/tafuncseries.pas
+++ b/components/tachart/tafuncseries.pas
@@ -449,6 +449,7 @@ end;
 
 procedure TFitSeriesRange.StyleChanged(ASender: TObject);
 begin
+  FSeries.SourceChanged(nil); // reset FState to fpsUnknown
   FSeries.ExecFit;
   inherited;
 end;