Dropdown menus in Internet Explorer when choosing click as trigger

[Delemo]

Hello everybody,

I have a little problem with my dropdown menus in Internet Explorer 11.
In T3, in Navigation tab, I've chosen 'Click' for the Dropdown trigger.

In Internet Explorer 11 my menus don't work well: after a click on the 1st level menu link, the dropdown is appearing but it disappears immediatly.
With a longer click you have sometime the chance to keep the dropdown visible.

You can test here: http://iat-lille.com/joomla/

My config:
Joomla 3.6.4
T3 Blank 2.2.3
T3 Framework 2.6.1

Thank you for helping
Simon

PS: I'm posting my question here because I can't in the T3 forum: Invalid captcha response error