Strange behaviour on page

WEB TMS WEB Core
1

I'm not sure that this is a webcore issue or not, but I'm having a strange issue on a webcore page which I haven't come across before.

The page is created like this

Procedure TMainSiteForm.ShowForm(AFormClass: TWebFormClass; Const ADisplayedPage: TGadgetPage;
  Const ANavDirection: TNavDirection; AProc: TFormCreatedProc = Nil; AlwaysClose: Boolean = false);

[async]
  Procedure AfterFormCreated(AForm: TObject);
  Begin

    If AFormClass.InheritsFrom(TCoreWebForm) Then
      TCoreWebForm(AForm).OnSelfClose := OnFormSelfClose;

    If AFormClass.InheritsFrom(TBaseSiteForm) Then
    Begin
      TBaseSiteForm(AForm).NavDirection := ANavDirection;
      TBaseSiteForm(AForm).OnSitePageChange := MainPageUpdate;
      TBaseSiteForm(AForm).DoChangeSitePage := ChangeThePage;
      TBaseSiteForm(AForm).DisplayingAs := ADisplayedPage;
      Await(TBaseSiteForm(AForm).InitForm);
      TBaseSiteForm(AForm).AfterLoaded;
    End
    Else If AFormClass.InheritsFrom(TCoreWebForm) Then
      Await(TBaseSiteForm(AForm).InitForm);

    HideWaitMessage;


    If Assigned(AProc) Then
      AProc(AForm);

  End;

Begin
  // Note that MainPanel is no longer a component. This now just uses a div on the template with that id.
  If Assigned(FDisplayedForm) And (FDisplayedForm.ClassType = AFormClass) And (AlwaysClose = false) Then
    Exit;

  If Not CloseDisplayedForm(True) Then
    Exit;

  FDisplayedPage := ADisplayedPage;

  Application.CreateForm(AFormClass, 'MainPanel', FDisplayedForm, @AfterFormCreated);

End;

After the page is loaded all the fields on the page get stepped through and the focus ends up at the bottom of the page. This all happens after the OnShow event and after my AfterLoaded method is called.

Any ideas?