Password Focus

When I have set "Require Vault Password" for a login, the keyboard focus does not automatically fix on the vault password entry pop-up box, but is on the web page itself and if I don't click the vault password box, I end up putting my vault password into username of the web page. This is only happened recently.  I am using Windows 10 with IE 11, but it was happening prior to upgrading to Windows 10 from Windows 7.