Internet Explorer 11 compatibility mode
I had to put IE in compatibility mode to get your user interface to work properly. I highly recommend that you visit the modern.ie website for tips on how to better support modern version of IE. It's pretty discouraging to try a new product and have to revert your browser back to older standards.
Swiftkanban works on IE11. Would really appreciate if you can provide us details of which functionalities are affected in IE 11 even screenshots will help.