Do you mean that there is a field that wasn't there before in the screen? Or that the Sprint field is not displayed, but you can't perform this transition.
Depending, the "problem" could be:
Either way, this doesn't happen by accident. Your JIRA administrator(s) changed one of these configurations.
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG