Drag and Drop not working right in IE

Hi,

I am using CP8 and created a course that has 2 drag and drop interactions. The first drag and drop works just fine in all browsers, but the second drag and drop isn't releasing the next button (on success) as it should be, but it's only doing that in IE (8 and 11). It works just fine in Safari and Chrome and shows the Next button when the learner gets the answer right.

Any ideas on why it would be doing that?

Thanks,

Kristen