Thanks for writing in! To assist you with this issue, we’ll first need you to provide us with your URL. This is to ensure that we can provide you with a tailored answer to your situation. Once you have provided us with your URL, we will be happy to assist you with everything.
What’s the version of your IE browser? Please note that IE doesn’t fully support CSS3 while other browsers do. Flip animation and card CSS isn’t supported by IE. Your cards works on my IE11 (Update version: 11.0.34 KB3175443) and Edge browser, hence, your IE browser might be old.