Bootstrap modal does not close on "esc"

Question

I have a regular bootstrap 3 modal:

div id="test_modal" class="modal animated fade" role="dialog" data-keyboard="true" tabindex="-1" 

But on the ESC keyboard, it works only after a single click inside the modal code, just pressing "esc" allows the cursor to disappear only by returning to the "click".

Can anyone explain this to me and advise?

thanks